: Most active firmware links are hosted on mirrors like Needrom or shared via community posts on 4PDA. Quick Installation Overview Backup : Ensure all personal data is saved before beginning. Drivers : Install the Lenovo USB Drivers on your PC.

: Power off the phone, remove the battery (if possible), and connect it to the PC via USB to start the process. Which specific version Custom ROM Tutorial for S820 8GB | PDF | Booting - Scribd

: To install custom ROMs, you will need either TWRP or CWM recovery, both of which are flashed via a PC. Essential Download Links

: The primary software required to flash official firmware or recovery from a Windows PC.