Vivo Y55 : Unlock Bootloader and TWRP

New TWRP Update (April 2018), flash it using mi flash


This is for Vivo Y55A, Y55L, Y55S

power off phone
hold vol up + down connect to computer
check device manager port is connecting to 9008

Unlock secure boot bootloader

  • open Qfill run as admin
  • Flat build
  • Programmer path > select prog_emmc_firehose_8937_ddr.mbn > (select build)
  • Select tools menu > Partition Manager > select OK
  • wait for the process it will pop up partition manager
  • scroll partition manager to bottom
  • Select aboot > Manager Partition Detail > select load images
  • choose emmc_appsboot_no_secureboot-1.8.4.mbn


  • select recovery > Manager Partition Data > > select load images
  • Select vivo_y55_twrp_sign_enryptable.img
  • it will pop up partition manager again > Close
  • it will ask to reset the EDL mode > close
  • go to TWRP  pess power + power button

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