Brand new defective Canon 5D Mark IV error 20 and 30 on pressing the shutter or using movie mode 

Error 20 and 30 is an issue with Canon EOS's through the entire range, since ages already. Usually switching off and on as per advice on-screen will not repair it. You can try to switch it off, take the battery out, switch it on and the insert the battery. Or you can try to operate the cleaning function. If both does not help, then you could try charging the battery 100 % full and trying again. If that solved the problem then the battery is too old. You could remove the lens and lift the mirror with the help of the live-view button. If you see the shutter curtain / blades stuck / partially open / dropped, you need a new shutter. If the shutter looks ok, the technically inclined could open the camera case and manually turn the shutter gear. There is a video on RU-vid made by a guy showing the process, which is absolutely not for the faint-hearted. It will probably work, but it provides likely a temporary fix only, if the camera is older. The Canon service will charge the equivalent of about USD 150 - USD 300 for exchanging the shutter, depending on the model. In the USA that service is probably about USD 100 more, because the USA is no 1 with everything.

Same problem. Got the camera yesterday but had to time to unpack and set up. Set it up today, went to take my first shot and was greeted with Err 20. Seems to be a problem with the mirror not swinging up out of the way. From Canon's website: Err 20 Description: A malfunction with the mechanical mechanism has been detected. Resolution: Turn the power off, then remove and re-install the battery. Then turn the power on again. Err 30 Description: A malfunction with the shutter has been detected. Resolution: Turn the power off, then remove and re-install the battery. Then turn the power on again. I have turned the camera off and moved the battery multiple times. No joy. More evidence that mirrorless is the wave of the future.

Bring the camera to canon service center. I got same problem so after I bring it to service center, the problem is done

I own a Canon 5D MKII and recently starting getting the Error 30 message, during commercial photo shoots no less!! However, this is after many years of ownership, still unacceptable and is probably going to be costly to repair. Hate to say it, but these cameras are just not made to be used on a professional level..

Change shutter

Did you exchanged the product ?

but my problem with 5D MARK IV it start after 5 month when i took photo 5 or 10 the camera it stop nothing work then i take the battery out the camera then i return the battery to the camera my camera it come back work and after 10 shoot the same problem

Same error with mine 5d3 error 20&30 don’t know how to fix it ☹️

Stick in a memory card or switch in the menu on that you can shoot without

how to solve this prblm

It happens with my canon r50

good luck man in photo 5dmk4 is a good camera

Just tap it on the side lightly. 90% of the time it will fix it!

same happen to me.

Same thing happened with me

Ara vedio meta bena

How much did the repair cost?

Amar ta arokom hoyche nambar ta den

Fokat me video kyo banate hi Time pas kyo karte ho

Err 40 how to solve problem

card is not good man