1)Unlock bootloader (use bypass mtk loader)
2)Flash MIUI 10 Global Nikel, if your device MIUI 8-9 (No press volume)
3)Flash ROM MIUI 10.2.1 Nikel BYPASS + FIX LOCATION GPS + HOST BLOCK + ADB Enable (No press volume)
4)Use UNLOCKTOOL:
select "Redmi 6A"
select "preloader preloader_lcsh6797_6c_lw_m"
Press "DISABLE ACCOUNT + OTA". (Press VOLUME up + down)
5)Done.
Xiaomi Note 4 Nikel MTK 10.2.1 Global Firmware Remove MiAccount + FIX LOCATION GPS + HOST BLOCK + ADB Enable (Need use UnlockTool).rar
https://androidhost.ru/A48