This Lenovo S90 firmware flash file (stock ROM) will un-brick and restore your device to its default, factory state. If you previously rooted or modified the system partition in any way, flashing this stock ROM will overwrite all existing modified system files to replace them with factory software.
Make sure to backup all valuable data on the phone, like contacts, messages, app data, etc. This is usually a necessary step before flashing, or resetting your smartphone or tablet. After this process is complete, all data on the device is completely lost.
Again, make sure the phone is charged to at least 30%. So the flashing process is not interrupted by a low battery. Interrupting the firmware installation could result in a dead device.
Follow the recommended flashing steps right after the download options. You can get the firmware file from the link below. Please report any broken links you discover.
Download Lenovo S90 stock firmware
Size: 850 MB
Size: 669 MB
Important! Always backup existing firmware before flashing any other firmware.
How to flash
After you’ve downloaded the firmware from one of the links above, unpack it into a folder on your computer that’s empty. Get a functional USB cable, then follow the instructions via this link to learn how to flash the firmware.
If you have any questions or other contributions, please post them in the comments section for assistance.