AndroidTool_MASKROM.png (12.89 KB, Down times: 470)
it will boot into MaskRom mode, which waits for host to send bootloader code through USB, then runs it, so that bootload can take control again.
sudo upgrade_tool uf rockdev/Image-rk3399_firefly_aio_box/AIO-3399J_Android7.1.2_AIO-3399J_180529.img
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