I tried the IMEI tools and JAF patchIMEI ,but nothing changed
when i use JAF patchIMEI, it allway shows :
Getting MCU ID
MCU ID: 0x1052
Switching to serial...
Powering the phone...
Retrying...
Retrying...
Reading...
Phone type: RH-12, Software version: 05.50, IMEI: ???????????????
Product Code: 0519195
Patch is not available for this phone...
the phone is RH-12 6230~
and ,where is the IMEI Tool Manual?
Thanks everyone~

you can't use JAF to patch the IMEI of your phone co'z it wont happen.Just take a look at your IEMI.it's already ????????????.JAF can't fix that problem.you'll need to replace the UEM or you can fix it using Griffin LOGS.

BR.

Can UFS box fix this promble?thanks

brother imei possible to change but no signal without logs