Rock5/install
ROCK 5 supports different storage media for installation, they have different IO read/write speed. Choose one to install:
Classic installation options
Advanced installation options
To boot from M.2 NVMe you need to flash your desired image to the SSD and also update the bootloader on the SPI to enable NVMe boot support.
If you do not own a USB to eMMC reader you can alternatively flash the eMMC with the help of the maskrom mode:
Additional
The ROCK 5 supports maskrom mode, which is a special operation mode for CPU to wait for command from the USB-C OTG port.
The Rockchip Flash Tools are the tools required for this.