Flash edk2-rk3576 UEFI
or mainline U-Boot: to SPI NOR on ROCK 4D, to eMMC on CM5-IO.
Requires Chrome or Edge (WebUSB). No drivers needed on Linux / macOS.
Select your board above
Hold the MaskROM button, plug in USB-C, then release
Click a flash button and pick the Rockchip device from the browser prompt
After the loader is sent, click Reconnect Device and pick the device again
Wait for Flash complete — the board reboots automatically
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Flash custom image…
Drop .img / .bin here, or click to browse
Warning: This overwrites storage at offset 0.
An incompatible image will prevent normal boot.
Recovery: hold the Maskrom button while powering on to force
USB recovery mode, then re-flash via this tool.