REFERENCE Vivo Y81 (1808) auto fastboot mode done by mrt with tested firmware.

[yianne]

Tested firmware here download
open mrt
select vivo tab
select y81s model
select write flash
open flash file folder which downloaded
hit start and insert usb calble
wait until done

https%3A//i.imgur.com/b3xQLqy.jpg[/img]']

 

[DY]

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