Boot from m.2 ssd?

how can I boot from m.2 ssd???
I managed to use one as secendery drive
but I got lost when I was tring to boot from him
I know there is instructions but I faild to connect my rock 5 to the pc
is there a video that explain this???

I think there is no workaround to connecting the Rock5b to a pc or mac and writing the U-boot image to the SPI Nor Flash chip on the Rock5b in order to achieve booting from a NVME SSD. Follow this guide : https://wiki.radxa.com/Rock5/install/spi
I had to erase the SPI Nor Flash chip (instructions at the end of the guide) first before flashing it from my Windows pc.
Also make sure to use a tool like BalenaEtcher to get the OS on the SSD.

Hi,
If you don’t have an ‘M.2 NVME SSD to USB3.0 reader’, you should use dd command since you are already using the SSD as secondary drive.
You can copy a boot image of the micro SD or the EMMC which you are using as boot media to the M.2 SSD by dd command. It’s like “sudo dd if=/dev/mmcblk1 of=/dev/nvme0n1 bs=1M status=progress”. Then you should expand the rootfs to full size of the SSD using Gparted tool. After flashing the SPI Nor Flash your Rock 5B can boot from the SSD.
Good luck!