hello
following the last update my network 4g is only in my country and when I leave it it remains in R as roaming
I contact the service and no problem and to be certain I try with another phone.
so i wanted to install rom to retract the bad update.
but now it's all black screen it turns on the sound is good but no picture.
that she is the solution thanks in advance

hello,
you cantry to enter thefactory mode to reset your phone.
here is the guide link:
viewtopic.php?f=192&t=334922