Teardown of an Ingenico iWL250 Payment Terminal 

Those pieces of PCB material with a step machined in that are soldered on top of the legs for the connectors are very likely just to protect against someone drilling a hole in the back case and directly probing the connections to the card readers and thus stealing people’s card details.

The other slots on the modem board are likely for a SAM card or a similar smartcard in the standard ID-000 size used for additional authentication.

8:04 Its a fallback if the chip malfunctions on the card, i know because i had one if my cards fail in this way.

I doubt the key sram is in the PCB material. It'll be in one of the special SoC/Microcontrollers. The is a CCC (I think) presentation about extracting the keys from cable TV boxes that details breaking down similar setups (albeit with less tamper proofing). That guy eventually worked out enough of the chips to load a trojan onto the chip and extract the keys.

They might have got rid of it due to the 3G shutdown. Any sort of 3G comms equipment is basically worthless at this point. The devices I use seem to occasionally self-trip their tamper detection mechanism, rendering them useless. They also don't use epoxy potting, as you say, expensive to produce. I think it just relies on the numerous serpentine traces. There may be other small things like light sensors or accelerometers as well.

I found this very fascinating. Thank you so much for sharing:)

Super awesome video! Love it! Looking forward for more content like this :)

It looks like one of them at least was an antenna. The other might be too for things like nfc wireless payments. For things like google pay and apple pay and physical cards

thank you for sharing your video. where did you get the screwdriver? thank you

Is it possible to use the inbuilt printer outside of the device itself. So at least there can be some use for it ??

@MarkFurneaux How do you fix the port if it won’t charge with the wire in the port? It seems loose? It’s this same model. Please help! 🙏🏻 Thank you. 👍🏻

Is it possible to convert this terminal into a thermal printer?

Awsome so interesting

only one question has to be asked can it run doom

Hi your videos are super helpful, do you have discord ? I would like to contact you on that platform as I have some questions regarding my pc storage

I can't see why it should have any secrets, it can read it from the smart card each time there is a payment, the bank can hide it there. edit: or the card could do the communication itself and the terminal just relays the encrypted messages.

Hello Mark, we would like to invite you to try our products. Could you please send us an email?