Step by Step Format/ FRP VIVO Y81 &Y85

On PC
Launch MRT Tools and Choose MTK Tools

Choose & Tick
* VIVO (BBK Only)
* Format (Unlock)
* X21i_Only
* Tick X20X25 Creat New gpt Block (*important*)

On Device
* Boot Device to Recovery Mode (Volume Up + On/off) and connect to PC.
* Choose advanced options
* Reboot with adb (driver must install properly)
* After device reboot, press start on MTK tools.

Sample:
>>> Device driver identification:
MediaTek USB VCOM (Android)
Version:PD1803F_EX_A_1.16.5
IMEI:869938039xxxxx
Flash ID:150100524436344d420148cbce031575
>>>>doing factory reset...
>>>>doing factory reset2...
all is done!!!

For FRP:
* after phone reboot, just set up like normal.
* last step will ask for: set up your device.
* just simply tap on set up.
* for 工程模式 floating icon, just press and hold on that icon. the will icon will now disappeared.