No. Flashing stock ROM does not require root. In fact, flashing can remove root.
After a factory reset, you’re locked out because you can’t remember the previous Google account credentials. Flashing the stock ROM can reset the FRP (Factory Reset Protection) partition.
Enable Developer Options – Tap “Build Number” 7 times in Settings → About Phone. sanno i7 plus flash file firmwae mt6580 update stock rom
Disable Auto Update – Prevent accidental OTA updates that may re-introduce bugs (since custom recovery is missing).
Join the Sanno i7 Plus Firmware Discussion Group on Telegram: @SannoFirmwareHelp (English/Spanish support). Enable Developer Options – Tap “Build Number” 7
Avoid random forum links. Recommended sources:
Filename example: Sanno_i7_Plus_MT6580_20231021_8.1.0.zip (Size: ~900 MB to 1.2 GB) Disable Auto Update – Prevent accidental OTA updates
No – MT6580 requires a PC and SP Flash Tool. There is no “SD card update method” for this chipset on Sanno devices.
If your phone doesn’t power on at all (except for a red LED blink when connected to a PC), the preloader is likely corrupted. Flashing can revive it.