VIVO Y12 and VIVO Y15 (PD1901BF) Preloader file which helps you to flash official firmware in a normal flash mode. the file is released by unlocktool team and tested by me in a VIVO Y12 with the latest security update install. I have tried to unlock the device FRP lock and I m easily unlock it with help of this preloader file.

Download

• Vivo_Y12%252C_Y15_PD1901BF_EMI_preloader_k62v1_64_bsp
• Vivo_Y21_New_Sec_Patch_MT6765_EMI_Preloader
• Driver Installer Unlocktool

How To Use Custom EMI Preloader File By Unlock Tool

1. First Download Unlock Tool Or EMI File Open Unlock Tool
2. Go Click MediaTek Tab and Select MTK Universal Tab
3. Click Custom Preloader EMI Model Select Vivo Y21
4. Select Custom Preloader Vivo Y21 Y15S Y15 Y12 [New Sec Patch]
5. And the Final Step Click Frp and Connect The phone with a USB cable.
6. If you Face Any Errors Then You Can Install the First Drivers.

Vivo Y21 Y15S Y15 Y12 After Erase Frp Dead Solution 

1. Click VIVO Tab And Search Model Bar Vivo y21,
2. And Select Vivo Y21 new security Patch This Method,
3. After Vivo y21 Dead Only MTK Port Show I Am Dead Recovery Done Tested By Me Tool Using Unlock Tool Just Factory Reset+FRP Job Done After Now Set On Normally