VIVO Y55S FIRMWARE INSTALL
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VIVO Y55S FIRMWARE DRIVERS
Keep trying and your computer will start installing drivers for Port 9008 Remember you have to press power button at the same time you plug inn usb cable. You will see logo blink for a second on your phone.
Read More: Increase Ram Size on your Device Step 7 :
VIVO Y55S FIRMWARE PC
Then connect the Vivo Y55s PD1613BF into PC and press volume up or down button.