Camera failed warning on 4.4.2

Hi I hope you can help me with this,

I was on a custom 4.3 rom running on old bootloader. I then
updated to 4.4.2 rom but my camera is not working only a black screen and giving
me a warning message " Camera failed" and once that happens
the whole system lags. I've read around that it could be a hardware
problem but when I switched back to the 4.3 rom the camera is working
smoothly again. I have tried 3 different 4.4.2 custom roms but same issue persists.


My question is could this have anything to do with my bootloader? I am planning
on flashing a stock 4.4.2 firmware with the new bootloader to see if that helps but what
worries me is if this doesn't help then I have no way anymore to go back to
a 4.3 firmware where my camera still works. Can you help me point to a solution
to this problem? Or which stock firmware I should flash to test if my camera
will work on that firmware.

Lennyz1988 said:

Did you fully wipe before flashing?

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Yes full wiped in Aroma, Formatted Int/ext card from Philz recovery, restored factory
from rom didn't help either.

Lennyz1988 said:

What custom rom did you flash? Do you use the correct modem for the old bootloader?

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I have tried Phoenix ROM, GoldenEYE , ECHO ROM, I am not sure if
I am using the right modem though I just flashed the file suggested on this page.