Question [Q] crush at start

Good day! I have 2 jfltexx devices. One comes from Zurich and another one is from Paris. Both have the same ROMs and MDM installed and have been flashed more than once. After installing another one ROM, the french one had errors <<Unfortunately, the process has stopped>> just after booting. I have full wiped the phone 4 or more times, flashed modem to I9505XXUEMKE, later to I9505XXUEMK9. Also kernels and ROMs have been changed (together with swiss one).
Is there a way to fix it? It does not bother me very much, but still.
(Yes, I have been looking for solutions. None of them worked)
P.S. I think it started at 4.4.2 v1 of this ROM.