Follow the below mentioned steps to upgrade to Xiaomi MIUI 10 – Developer ROM from MIUI Stable ROM and the good news is, you do not need unlocking the bootloader or fastbooting…
How to upgrade Developer ROM from Stable ROM ?
- As this method wipes the user data partition (removing your apps and other data including media), backup your device first.
- Download the Recovery ROM and make sure the battery is charged above 60%
1- Open the “Settings – about phone – System Update
2- Press three dots
3- Choose update package”, select the ROM package you downloaded in Step 1.
4- Reboot the device when asked, let the process complete & post restart your will be greeted to MIUI 10 start-up screen.
Caution: All data will be deleted on the phone! Backup your device first!
For more details see:
How to update MIUI on Xiaomi devices?