[X3non]

after unlocking the bootloader everything works (of course except imei and imei sv)
if I were able to solve the problem imei after unlocking the bootloader this thread would have no reason to exist.
the root flashing patched_boot.img with fastboot with unlocked bootloader works great
the ROM that I loaded in SPFT for the flash of patched_boot.img (renamed boot.img) is the same installed on the phone.
by the way, I have 3 versions of the same rom (found on the internet) and I've tried them all.
the rom that originally had the phone was ruined after a week that I had it because the phone was bricked when I tried to get root permissions by following the instructions of another site (damn them).
summarizing:
current situation: either imei without root, or root without imei.
the solution is there, I feel it, I feel it near, just do not give up-

so if i understand you correct, you can flash that same rom successfully if you don't replace stock boot with patched_boot. right?
which of the imei repair methods @ https://forum.hovatek.com/thread-116.html did you try?

at least one of the different imei repair methods ought to work but another thing you could try is to attempt to readback nvram partition before unlocking bootloader [ie when IMEI is still intact], if readback is successful then unlock bootloader and root then flash nvram