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Anyone out there can help to force Manual mode on my 5Dmk3?

Thanks a lot for the reply a1ex, and help. At least it's better to know something rather than imagine.
Is it possible that an overheat could cause the hardware problem? I remember I was doing a 1 hour something shooting with that camera, then gave it to someone else for keep recording interviews, and then he called me because camera gave an error and couldn't be shut down. But the battery drain problem was present already at that moment.

After that, it started to get worse, during some attempts a next day, and after changing firmwares and trying different ML versions (between 1.2.3 and 1.1.3). Until it just refused to work in M mode anymore.

If it can be forced to M mode, that would make it at least usable. I don't remember the last time I used any other mode.
Unfortunately, I never worked with compilers : ) So I would have to google a bit too much, so if I can try something already "baked" that would be much much easier!
Thanks again for the invaluable help!

Hi again a1ex. I tried to find everywhere a backup of my ROM but couldn't find any ...
I downloaded the firmware for logging, and did a bunch a logs.
https://www.dropbox.com/s/ec3zacqtxrv0e8a/5Dmk3%20non%20working.zip?dl=0

Very much appreciated if there is a way to make the camera work again in manual mode

Hi a1ex, i'm sorry. I didn't have the notifications on, so didn't see your post.

I tried to find an old ROM, but no luck X-/ (I also formatted my cards a few times, thinking the cards were at fault)
So, is there hope even without original ROM?

Stopped working I refer to anything related to manual settings like shutter speed, aperture, iso (this one gets automatic to "auto" every time I change the shooting mode, but can be changed to something else afterwards, but if it shuts down, then again goes back to auto). Shutter speed and aperture are always in auto now.
There is no "M" mode anymore, it goes to "C2p" mode instead of "M". "Av" mode goes to "Auto", "Tv" and "P" goes to "P" mode. And "B" goes to "C1p" as well.
So every mode related to manual settings are changed to another mode where everything is more automatic.
This is without any card in the camera.

It still drains the battery while turned off.

Hi, not totally sure it was related to MagicLantern, but it surely started after with it (after several years of successfully using it).
It all started one day with the LED red light in the back not turning off (keeps blinking even the camera is off). I tried everything, formatting cards, changing from v123 to v113 and vice-versa, but nothing. Battery was slowly drained too.

After several attempts of installing and uninstalling ML, finally all the manual modes stopped working (nothing related to manual worked, no P mode, no M mode, either video or photo). Auto modes, and C modes works fine. Pretty weird.
My last attempt was to uninstall ML, and update the firmware from Canon website to the latest, but that didn't solve anything.

Any ideas? I have an expensive Point and Shoot now : (