![]() ![]() The tools were later published on the Web for anyone to use. You can then use one of the compatible flashing tools to update the firmware on your smartphone or tablet.įlashing tools were initially developed by the companies that were associated with the device’s hardware and were mainly kept in-house, adopted in the back rooms of smartphone repair centers to fix common mobile device-related problems. Here’s what you need to download the official Vivo Y21L stock ROM (firmware) flash file onto your computer. ![]()
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