This method tested by me if you have LYF Flame 1 LS-4503 device in that issues of like hang on logo, restarting problem, pattern lock, screen lock then you can use this guide and this without any box you can do just before use remember of must be charged your device battery cause if low device turns off during the process not starting so carefully use.
- Press & hold Volume Up + Power until Android System Recovery Menu
- Select "Wipe Data / Factory Reset" from Volume Down button Press Power key to confirm
- Select "Yes -- delete all user data" option using Volume Down key Press Power key to confirm
- You will see Wipe data processing like below
- -- Wiping data...
- Formatting /data...
- Formatting /cache...
- Data wipe complete.
- Last select "Reboot System Now" wait for device start normal a few minute
- Congratulation you are done