HOW TO FLASHING VIVO Y12 - Y15 ( 1901-1904 ) DOWNGRADE ANDROID 11 TO ANDROID 9

Vivo Y12 - Vivo Y15 ( 1901-1904 ) Downgrade Android 11 To Android 9 that is an article that I will show you all, for this device we still cannot use flashtool, because I have tried several times and I have changed the DA file or a suitable vivo y12 - y15 firmware but still the result will be an error like the SEC IMGHDR Failed is issued, so what I will show here is to use the UFI Dongle / UFI Box, with the UFI dongle my work is smooth and good, for those of you who already have a UFI dongle or ufi box please follow the method I show, for vivo y12 and vivo y15 firmware there are several variants, including PD1901EF for vivo y12 - y15 1904 and for PD1901BF for vivo y12 - y15 1901, so please use and match the firmware version

FACTORY RESET / UNLOCK PATTERN / PASSCODE VIVO Y91 - Y93 WITH FLASHTOOL

Vivo Y12-Y15 PD1901EF ( 1904 ) Firmware

Vivo Y12-Y15 PD1901BF ( 1901 ) Firmware

Mediatek USB Driver Installer

Maybe that's all I show you today about how to Downgrade Vivo Y12-Y15 Android 11 to Android 9 using a ufi dongle, don't forget to keep following this page because there will be lots of files that I provide from some problems on your smartphone , also follow my youtube channel there are so many that I have shown for you all

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