Then i go back to stock rom and relocked the bootloader.
Now camera app always say, another application uses the camera and won't start.
alternative camera apps also don't work.
don't backup any drm keys.
is there any chance to get it working?
I would assume that relocking it without the DRM keys has broken it. To rewrite the TA backup img to the phone you have to use flashtool version 922.3 If I was in your position with or without a drm backup I would try using that version of the flashtool to flash a FW and try the relock procedure again to see if it makes a difference. Have you unlocked it again to see if it brings the camera back?
CONFIRMATION OF TA RESTORE!
- Unlocked bootloader
- Flashed TWRP
- Pushed TAbackup.img (I renamed it) to /data/local/tmp
adb shell dd if=/data/local/tmp/TAbackup.img of=/dev/block/bootdevice/by-name/TA
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