X081
L2 Service Manual
Display issue
SW
Re-insert battery then power on
Upgrade the software
HW
Re-solder the LCD FPC
Replace the LCD
Replace the PCBA
SIM ISSUE
SW
Re-insert battery then power on
Upgrade the software
HW
Replace SIM card
Clean SIM slot pins
Replace or re-solder SIM slot
Replace PCBA
LCD
FPC
LCD
PCBA