Older versions of the MSM tool require an official Oppo service account login.
Boot the phone into recovery mode (Hold Volume Down + Power). Select Wipe Data/Factory Reset , clear the cache, and reboot. No Network Signal / Missing IMEI oppo r9sk global firmware
Users seek global firmware for several reasons: Older versions of the MSM tool require an
Flashing firmware carries risks. Complete these preparatory steps to protect your data and hardware: clear the cache