5D3 won't reboot with SD card in (I'd like to restore to original 1.2.3)

[jweichel]

Hey all,

I got ML, but when I booted it up on my 5D Mark III, I got an ERR70 code. Now I want to get rid of ML and restore my camera to its original firmware. Help!

[Walter Schulz]

Top of page -> Downloads -> Nightly Builds -> 5D3.123-bleeding-edge
Format card using cardreader with NTFS. Insert into cam and format there. Insert into cardreader, expand downloaded file, copy contents (AUTOEXEC.BIN + FIR + ML directory) to card. Insert into cam and run firmware update. Wait for 30 seconds.