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Erase eMMC or SPI Flash

Enter to Maskrom Mode​

  1. Remove the MicroSD card and disconnect the power
  2. If there is an SPI Nor Flash on the board, short the SPI Nor Flash pins
  3. Connect to the PC host using a USB-A to USB-A cable from the OTG port
  4. Press and hold the Maskrom button
  5. Connect the power cable while holding the button, then release the Maskrom button. If the power LED stays solid green, you've successfully entered Maskrom mode
rock 4 maskrom button
rock 4 with no button maskrom wire

Erase eMMC​

  1. Generate zero.img

    dd if=/dev/zero of=./zero.img bs=1M count=64

  2. Make sure the host recognises Maskrom

    sudo rkdeveloptool ld
    DevNo=1	Vid=0x2207,Pid=0x350a,LocationID=109	Maskrom

  3. Flash Loader

sudo rkdeveloptool db  rk3399_loader_spinor_v1.15.114.bin
  1. Erase eMMC
sudo rkdeveloptool wl 0 zero.img
  1. Reboot
sudo rkdeveloptool rd

Erase SPI Flash​

  1. Generate zero.img

    dd if=/dev/zero of=./zero.img bs=1M count=64

  2. Make sure the host recognises Maskrom

    sudo rkdeveloptool ld
    DevNo=1	Vid=0x2207,Pid=0x350a,LocationID=109	Maskrom

  3. Flash Loader

sudo rkdeveloptool db  rk3588_spl_loader_v1.15.113.bin
  1. Erase SPI Flash
sudo rkdeveloptool ef
  1. Reboot
sudo rkdeveloptool rd