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Hacking a Knockoff Google Chromecast - Firmware Extraction 

Matt Brown
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In this video, I extract the firmware from a Chinese Google Chromecast knockoff.
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26 авг 2024

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Комментарии : 228   
@Icemourne_
@Icemourne_ Месяц назад
14:47 At the bottom it says LZMA compressed data
@4megii
@4megii Месяц назад
Glad I'm not the only one to see this. Rootfs is probably compressed within LZMA and then uncompressed and mounted via the bootloader.
@RetroDelete
@RetroDelete Месяц назад
I was just about to comment this, seems like it will be fairly easy to get access to the rootfs. +1
@monad_tcp
@monad_tcp Месяц назад
cliffhanger !
@guiorgy
@guiorgy Месяц назад
Towards the end of the video I could swear I had seen "lzma" somewhere, went back to strings and watched closely while pausing, thought I was going crazy 😂
@pete3897
@pete3897 Месяц назад
It's only 8MB though - the 980MB partition a couple above it will be the interesting one I would think...
@Mr._Mythical
@Mr._Mythical Месяц назад
I wish these videos were longer, i would love to sit here and listen for hours to you rambling about the innerworkings of a device nobody has ever heard of
@doubled8511
@doubled8511 Месяц назад
I love your videos man but they are just too damn short! I would happily sit here listening for a few hours whilst you ramble on figuring out how to extract the firmware.
@kennwood
@kennwood Месяц назад
Haha I was just thinking the same thing
@PILATESDILEMMA
@PILATESDILEMMA 4 дня назад
Short? Is 25 minutes, a whole episode
@M0UAW_IO83
@M0UAW_IO83 Месяц назад
16:58, there's reference to SC16550UART so there's good possibility of a UART output somewhere on that board for the bootloader
@bnister
@bnister Месяц назад
Yep indeed, it's pin 99 on the SoC muxed to UART2_TX quite early on. It's supposed to be pulled up externally + there are some suspicious test points at the other side, but, generally speaking, manufacturers rarely care enough to break this one out in any convenient way
@qwertykeyboard5901
@qwertykeyboard5901 Месяц назад
Might be on the usb port. Sometimes they do that.
@martontichi8611
@martontichi8611 Месяц назад
binwalker said on the bottom that there's LZMA compressed data. Uncompressed size is 7M! probably squashfs!
@dazealex
@dazealex Месяц назад
Also saw in the string something about unzip length.
@dieSpinnt
@dieSpinnt Месяц назад
Great work and thanks for sharing, Matt:) Side-note, Tip, Womansplaining: Calipers 4TheWin! So you can measure the dimensions of the package. Works when soldered in and after some time you memorize the dimensions of TSSOP/SSOP/SOP/etc anyways. "To measure is to know!" And as a poor-(wo)men's-alternative: Print out a sheet with the whole zoo of electronics packages in the scale of 1:1
@KallePihlajasaari
@KallePihlajasaari Месяц назад
Do you have a link to a sheet that you can link to for us other newbies?
@unh0lyav3ng3r8
@unh0lyav3ng3r8 26 дней назад
@@KallePihlajasaari i got an actual ruler with different package sizes on it..
@sjoervanderploeg4340
@sjoervanderploeg4340 Месяц назад
@17:23 it clearly says HDCP :D "HDCP stands for High-bandwidth Digital Content Protection. The purpose of HDCP is to protect digital copyrighted content as it travels from a device to your TV, usually through an HDMI, DVI or DisplayPort connection." You might be able to interface that programmer with flashrom, I'm not sure if it is but it should be possible to implement! I own a "Willem EPROM Programmer", it also supports SPI flash memory like these but these days I generally use a very cheap ch341a_spi USB device.
@tweebs1
@tweebs1 Месяц назад
I really enjoy seeing how you methodically figure out how things tic and then bypass the security like its not even there. Firmware should be open, so we may use hardware as we see fit.
Месяц назад
There's seem to be a compressed LZMA region, i'm pretty sure it's what you seen as high entropy, i'd bet it's the compressed rootfs mounted by the bootloader. Many times the MAC address is the one injected for the Wifi, as those modules don't have any hardcoded, Really interested to see your deep dive analysis. I'll join your discord, hopefully i can find the dump and analyze it myself also. I'd buy one of these if these if there's the possibility of a custom Firmware.
@4megii
@4megii Месяц назад
I think you're spot on about LZMA being the rootfs and that it's uncompressed and then mounted by the bootloader.
@allwitchesdance
@allwitchesdance Месяц назад
I bet it's going to be a kernel with the built in rootfs. No reason for these little gadgets to pivot root to a real file system
@309electronics5
@309electronics5 Месяц назад
​@@allwitchesdancei had a miracast device that had a full rootfs and a kernel. It even had a recovery kernel. Mine used a Actions semiconductor SOC
@bnister
@bnister Месяц назад
Yeah a custom one is possible, but I bet you won't like the only FreeRTOS-based SDK available
@TheWarhoop
@TheWarhoop Месяц назад
Watching SMD's getting soldered onto PCB's is so satisfying... don't judge, I'm just saying what everyone's thinking. BTW, @Matt Brown, I switched to those little foam tipped eye makeup brushes which really elevated my flux clean up game over the Q tips, give 'em shot.
@mattbrwn
@mattbrwn Месяц назад
I'll have to try that. Getting those Qtip hairs everywhere is annoying
@jamesdim
@jamesdim Месяц назад
My new favorite tech channel! Can't wait for the next hack adventure!
@saschaschnuppe3409
@saschaschnuppe3409 Месяц назад
What exactly did he hack?
@Z-Ack
@Z-Ack Месяц назад
I like how you spend way too much time going over all the laymen stuff like how to solder then jump through all the coding log processes and writing…lol
@functiontek
@functiontek Месяц назад
Don't know if someone already mentioned it, but I would bet that key you saw mentioned at the start is unrelated to the encryption. It has "HDCP" in it, which would make more sense to be HDMI Content Protection instead.
@tal1296
@tal1296 Месяц назад
Love your videos,I saw in strings HDCP which is hdmi copyright protection
@CosmicMyst
@CosmicMyst Месяц назад
I think I ventured into the fun side of RU-vid
@samuraidriver4x4
@samuraidriver4x4 Месяц назад
The silkscreen of footprint on the board is a bit akward due to it being a fairly universal footprint. I do agree with you about the lead free solder, its definitely leaded solder seeing how easy it melted. No issues with using leaded solder in in China.
@Roadbobek
@Roadbobek 26 дней назад
I have no idea what’s going on but I watched the whole thing
@quetzalcoatl-pl
@quetzalcoatl-pl Месяц назад
16:20 'anonymous' and '88888888' sounds like a default user-password pair, 8x 8 being the password, IIRC the '8' is a lucky number in china, so eight 8x would be sth like seven 7s in US.
@TerrisLeonis
@TerrisLeonis Месяц назад
"anonymous" as the username makes me think of FTP.
@OsX86H3AvY
@OsX86H3AvY 15 дней назад
just came to say the same thing - thats exactly what it is
@JerryThings
@JerryThings Месяц назад
I love this kind of videos where you showcase your adventure! Hope to see some in depth analysis in the future regarding the fw :D ty Matt
@antivaxxtoaster8919
@antivaxxtoaster8919 Месяц назад
Another banger as per usual
@Fatpumpumlovah2
@Fatpumpumlovah2 Месяц назад
Really? What did you learn? Nothing but more propraganda, every device you own is made by chinese/taiwanese companies. America makes nothing and tbis guy has no clue
@meowyahh
@meowyahh Месяц назад
Really good work, youtube's algorithm brought me here!
@mikehensley78
@mikehensley78 Месяц назад
same. a few weeks ago a Matt Brown video was in my recommended vids. i been subbed/watching ever since.
@SailAway33
@SailAway33 Месяц назад
Thanks Matt for your great video. I love to see how you can pull these out and get the information from it.
@qweriop
@qweriop Месяц назад
Thank you youtube for showing me this channel! I love this kind of electronics hacking!
@compucar03
@compucar03 19 дней назад
I really want to see the next one! Disagree with some of the comments about your video being too short. It is just long enough so that I watch the whole thing and it leave me wanting next weeks episode! It is too short but that’s a good thing, in a way.
@ChrisMIA
@ChrisMIA Месяц назад
great stuff bro! been so much into software have been slacking on the hardware firmware side of things, good to have this under my belt especially with todays supply chain being chip tainted
@mmkf
@mmkf Месяц назад
I wonder if the filesystem is compressed in a non-standard way.
@rbmwiv
@rbmwiv Месяц назад
Great video I just subscribed. I really enjoyed the one shot approach. Nice job. I am fixing to check out the second part!
@riccardopolelli1825
@riccardopolelli1825 Месяц назад
Cannot wait for part two
@mogwopjr
@mogwopjr 2 дня назад
I like that D+ and D- are easy to trace out. Thanks for showing your process, I just got Xgpro working in anticipation for my T48 to show up tomorrow
@bnister
@bnister Месяц назад
You've got a fairly standard ALi Tech sat receiver dump :-) These run off a proprietary TDS2 RTOS. The HCSEMI clone chips have a FreeRTOS SDK available, but it's not as stable tbh
@revancedsubsfuckgimp
@revancedsubsfuckgimp Месяц назад
And here I was wondering why the NCRC string seemed so familiar.... likely MIPS based as well
@aldythsatya601
@aldythsatya601 Месяц назад
Glad to see this video, I don't understand the RU-vid algorithm but videos like this don't show up when I search for them, but they magically appear on the homepage 🗿. And I have 4 devices like that that can't connect even though they have been reset
@user-wy6iy7ij1z
@user-wy6iy7ij1z Месяц назад
It is like reading and flashing a motherboard BIOS chip, I did it many times, but after this, I didn't understand anything anymore, but this is really cool.
@ratkaelzey
@ratkaelzey Месяц назад
kay, I’ve always scratched my head about the obsession around the kislux book totes and their practicality, but this one is adorable!! Congratulations
@hafiz468
@hafiz468 Месяц назад
8:16 What the FLUX is going on here ?! 😂
@-r-495
@-r-495 Месяц назад
using possibly compromised sw to dump a knockoff product. like it! 😏
@adagioleopard6415
@adagioleopard6415 Месяц назад
They put two footprints on top of one another so if the wide version of the chip is unavailable they can use a regular soic8. We did the same but we at least made a package with nice looking silk so it didn't look so crap
@pap3rw8
@pap3rw8 Месяц назад
I would guess it's compressed based on the output of strings including "unzip" but it's possible there's also some encryption of the bootloader or whatever.
@allwitchesdance
@allwitchesdance Месяц назад
The two lzma blobs are probably the kernel and initramfs
@bnister
@bnister Месяц назад
One's the kernel, and another (usually) the localization data. This thingie doesn't need any fs at all
@saad1983
@saad1983 Месяц назад
@Matt Brown good sir. you are on fire lately. another awesome video.
@davidezequielborges392
@davidezequielborges392 Месяц назад
to clean stuff you can use an old toothbrush instead of qtips so it doesnt left off any fibers, at least to remove the most of flux witout much hussle.
@wasabinow
@wasabinow Месяц назад
Cool stuff! Thank you for sharing your electronic adventures!
@Sonny482
@Sonny482 Месяц назад
Great job! Which microscope / camera do you use?
@fronbasal
@fronbasal Месяц назад
Matt this was absolutely fantastic. Thanks for sharing!
@samuie2
@samuie2 Месяц назад
There were multiple strings that referred LZMA and unzip "main code". I think that the code is just compressed, and the key if for hdmi drm not the firmware.
@paerrin1
@paerrin1 Месяц назад
Another great video! Keep them coming!
@adamkavala
@adamkavala Месяц назад
Good job, looking foward to see more progress.
@poweron3654
@poweron3654 Месяц назад
17:18, NCRCHDCPKey refers to HDCP, or high-bandwidth digital content protection, it is not an encryption key for the firmware
@OsX86H3AvY
@OsX86H3AvY 15 дней назад
and CRC is just cyclic redundancy check used all over to ensure data integrity I believe....so baciasll the string after that is just the HDCP key needed to get around content protection - I mean not get around it but actually use it properly
@TheGreendabomb
@TheGreendabomb 17 дней назад
You said you didn't open it.. then you said you opened it.. 😂
@npegg
@npegg 3 часа назад
"lets just not think about that right now" lol
@pamelax64
@pamelax64 Месяц назад
Let's wait for the next video about it,interested!
@n2cthe1
@n2cthe1 Месяц назад
love your videos, i also think there too short... i enjoy complete and in-depth look into IoT
@roelbrook7559
@roelbrook7559 Месяц назад
You've got LZMA compressed data there. That might explain the entropy results you're seeing.
@toxicpsion
@toxicpsion Месяц назад
that entropy spike is totally compression; probably a ramfs of some kind, looks like it showed up at the bottom of binwalk.
@UndeadAlex
@UndeadAlex Месяц назад
Loved this man awesome work!
@videshx818
@videshx818 Месяц назад
Nice soldering skills, I have one of this device in which the micro USB is detached. I am yet to solder
@raraujo4951
@raraujo4951 Месяц назад
Great video Matt,!!!
@RemovedBrain
@RemovedBrain 19 дней назад
Nice. One thing - that SW you are using, it is not (only) Chinese crap, it is standard crap. Those ergonomy-hells are created mostly by HW engineers who's simply doesn't understand how (and why) to make user friendly GUI. :)
@wlloxik
@wlloxik Месяц назад
this is the perfect video to listen to in the background lmao
@revancedsubsfuckgimp
@revancedsubsfuckgimp Месяц назад
Great video! Instructions (sequences of 4 bytes that end with a 0x3x byte) kinda remind me of little endian MIPS (similar to how ARM instructions can be identified by the 0xEx bytes)
@nohaynoticias
@nohaynoticias Месяц назад
"the logo for the company that makes this device" SHERLOCK!
@richiebricker
@richiebricker Месяц назад
very cool stuff. I look forward to learning from ya
@rrrlasse2
@rrrlasse2 20 дней назад
I think if it's encrypted, entropy is almost exactly 1. If it's compressed it might be slightly lower
@gamerriasaat6622
@gamerriasaat6622 Месяц назад
How about modding a xiaomi 4c router (which is really cheap) to port usb(it has two open data pins) and openwrt (just enable ohci and ehci in kernel while complling) and then make a wifi pineapple(decompile pineapple rom and port using overlay) bcz they both use mips24kc :) then tada 15$ pineapple 🍍 btw it has better specs then original pineapple...
@gamerriasaat6622
@gamerriasaat6622 Месяц назад
I can't try this bcz of my upcoming entrance exam for varsity...
@OsX86H3AvY
@OsX86H3AvY 15 дней назад
i have the xiaomi 4A gigabit and its super easy to openwrt, don't need to open it can do it just by firmware upgrade, and YES please someone make a pineapple out of it, I got part way there and had to move on to other things but I still have it and WISH someone would make it a package!!!
@AymanAlhkeemi
@AymanAlhkeemi Месяц назад
Please make a video on how to rebuild the firmware and calculate the checksum
@Ibrahim-rc8sn
@Ibrahim-rc8sn Месяц назад
What analyzation software do you use in 18:50 ? I subscribed to your channel , great content
@ilyassamraoui3234
@ilyassamraoui3234 Месяц назад
That's binwalk program running -E [capital e for Entropy, if -e it will extract firmware "structure" I guess ]....
@frtls
@frtls Месяц назад
Are these not cracking videos?
@phuo2185
@phuo2185 Месяц назад
can you make a video on synology TC500
@matheuscezar6309
@matheuscezar6309 Месяц назад
Nice! I'm curious to discover how to decompress/decrypt those data!
@bnister
@bnister Месяц назад
Bog standard LZMA. binwalk -e handles it well, but any unlzma tool will suffice. An RTOS2 SDK seems to come with the unmodified LZMA build from Igor Pavlov, too
@mikesyr
@mikesyr Месяц назад
Hi Matt, do they make clips for SOP8s that size? Seems like that would be quicker than desoldering that chip, then again it came off with no issue. :)
@309electronics5
@309electronics5 Месяц назад
Sadly often when you put the clip on it powers the flash but also the soc/cpu its connected to which then tries to read from it and messes up the firmware read
@bnister
@bnister Месяц назад
Yeah this exact platform has no trouble being dumped via the cheap ass clip usually shipped with CH341A kit. The LZMA packed firmware gets extracted to the RAM, and the SPI chip gets almost no accesses at all
@tomu1337
@tomu1337 Месяц назад
Another great video!
@kikihun9726
@kikihun9726 Месяц назад
It had a hdcp string above so that encrypted data propably contains hdmi hdcp handshake key too.
@surewill8190
@surewill8190 Месяц назад
always interesting to watch
@Holycurative9610
@Holycurative9610 Месяц назад
The anycast logo looks like it was stolen from Paul Daniels of Apple fixing fame...
@arashgudarzi2623
@arashgudarzi2623 Месяц назад
hey Matt, I like you videos and watched many of them. I am a student who loves hardware hacking. I started electronics basics and Arduino to kinda get familiar with the hardware stuff. do you have any roadmaps to be successful in this field of job ?
@VulcanOnWheels
@VulcanOnWheels 29 дней назад
1:01 You say, "*to* your TV", but I read "*on* your TV". Why do you keep hitting the Return key so often?
@Crapchannelbruh
@Crapchannelbruh Месяц назад
this broke my tv 💀
@hafo821
@hafo821 Месяц назад
it´s not a SPY flash it´s SPI flash! 🤣😁
@mattbrwn
@mattbrwn Месяц назад
I also say Sequel instead of SQL... 😂
@UndernetSystems
@UndernetSystems Месяц назад
The good thing about dumping the firmware is that you can just buy another flash chip and reflash it if it breaks.
@bnister
@bnister Месяц назад
Not unless the firmware ties itself to the flash Unique ID, and Chinese-sourced thingies usually DO... as a form of copycat protection
@adnanalam6201
@adnanalam6201 Месяц назад
Dude I've the same thing 😅 gotta follow this guy now
@jonathanzimmer8143
@jonathanzimmer8143 Месяц назад
Great video this was fun! Please do something on a Vortex phone, Oxtab tablet or other freeware. TV devices are big duh, I have an M-95 4k box that was immediate full throttle/unresponsive... turns out they're pretty much all spyware. Tried to hack my google acct from Shenzen. Oops. But devices handed out to the elderly etc are no longer motorola or lg, but chinese companies with knock off Galaxy designs and questionable Android builds.
@jheimissantos8682
@jheimissantos8682 Месяц назад
Nice video, Matt! Tks for share your knowledge! It's possible extracting the firmware via software? connecting via terminal (adb) and copy some partitions? sometimes i have dificult to consider what is the firmware, e.g all image firmware or only bootloader firmware.
@309electronics5
@309electronics5 Месяц назад
Adb is android only. If a device runs Uboot as bootloader you can interrupt the boot process and dump the flash.
@bnister
@bnister Месяц назад
@@309electronics5 This one doesn't, everything is proprietary. Doesn't like to respond over USB, as well. There's usually some form of OTA on these, though, but dumping is tough
@georgeyreynolds
@georgeyreynolds 22 дня назад
A lot of these devices have malware on them which lies dormant. If it turns out to be android etc , mainly the Android TV types.
@user-ff5yb9hh6c
@user-ff5yb9hh6c Месяц назад
I used bug prove for complication software.İt's can't decyrpt firmware if it's encyrpted but if it's uncrypted bugprove can good job and you can detect old binarys,vulnarabilities etc.
@Neolith100
@Neolith100 Месяц назад
If the XGecu Pro software is windows, how do you run it in linux? Are you using WINE or Bottles... I am incredibly curious?
@mattbrwn
@mattbrwn Месяц назад
Wine
@user-vg4io9sl9g
@user-vg4io9sl9g Месяц назад
The problem of Chromecast devices is too small internal storage, and i am curious can you replace the original with a bigger one?
@SolveElectronics
@SolveElectronics Месяц назад
HDCP is for video decoding HD streams
@foufou33g
@foufou33g Месяц назад
the key thinh seems HDCP related ?
@AppliedCryogenics
@AppliedCryogenics Месяц назад
Even if it's just video playback + TCP/IP stack + some RTOS, 4MB compressed seems wayyy too small to be the whole firmware.
@bossysmaxx3327
@bossysmaxx3327 Месяц назад
dude are you an american knockoff of china? By the way great video Here goes the subscribe puk!!!
@hoteny
@hoteny Месяц назад
Now you are an agent huh
@skeffers1988
@skeffers1988 Месяц назад
I have tryed to hack the m5 displays / ebike controller . I cant get the firmware extracted from this device over uart . I have 2 uart connections on this board this m5 display comes with the nuvoton MS51FCOAE whitch has more uart connections on it .
@markmuir7338
@markmuir7338 Месяц назад
China is taking a big risk having most of their systems run a proprietary OS made by an American company. Hard to change that though, given the cultural attachment to Windows - shown by most Chinese software only being available on that OS.
@Tim_Small
@Tim_Small Месяц назад
They're fine, they've got the source code...
@andreamitchell4758
@andreamitchell4758 Месяц назад
Can you extract FW from a twinkly ARGB LED controller next
@duefourbail
@duefourbail Месяц назад
what terminal ui is that when you check through the device i’m trying to learn more about the software you use
@MotSter
@MotSter Месяц назад
does it not work out of the box? Is there a further use goal to add to it or is this just pull the firmware cause you can as title kind of obviously states?
@MrCustomabstract
@MrCustomabstract Месяц назад
Goated vids
@tomteiter7192
@tomteiter7192 23 дня назад
I think the XGecu Software isn't that bad, it's rather barebones and packs a shtload of functions in a no-frills kind of way. To be honest it kinda feels like someones project rather than a productof a big evil chinese spyware flinging knockoff company.... A Linux Version and an API to add new programming algorithms and chips would be banger, though.
@mattbrwn
@mattbrwn 23 дня назад
Totally agree. As much as I complain about XGecu it's the best thing we've got.
@tomteiter7192
@tomteiter7192 23 дня назад
@@mattbrwn I still remember my utter disbelief when I first saw the older version popping up, together with a boatload of zif adapter sockets, for a total price of less than one tenth of what a single tsop adapter for a "respectable" programmer cost.
@MrL22
@MrL22 Месяц назад
14:46 LZMA compressed block hinting at 7.8mb of uncompressed data.
@kairu_b
@kairu_b Месяц назад
Interesting
@309electronics5
@309electronics5 Месяц назад
I actually had an miracast device which looked and worked simmilar to this. Just that it had an actions semiconductor soc and had 2 uarts onboard and i got a shell. Its funny to me how these chinese manufacturers manage to put Linux on everything (Shows how great Linux really is) but wont comply (at least my device type) with the GPL. Sadly yours might be running some custom os or a RTOS. Or its a weirdly formatted Unix os but thats unlikely. It might be encrypted and that the bootloader decrypts it and mounts the os
@bnister
@bnister Месяц назад
Nooope no Linux this time around, with no way to run one, to boot
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