Shouldn't the SPI flash show in lsblk?

[Freddy]

SUCCESS ! Disregard my previous post. Instead of using rsetup to flash the SPI with a new bootloader, I followed the instructions given by MX-Eng here:

Booting from SSD

Hello all I cannot put my Rock 5A in Maskrom however I already can booting from SSD. This is what i did NOTE: The SSD already must have the OS installed, here is how to do it (you can do it using an USB adapter to the SSD or booting first from microSD ) Booting using MicroSD (I used the oficial version ) and here you can see how to install de OS in a µSD Open the terminar (CLI) and enable SPI Flash rsetup Select “Overlays” (is a warning appers, press enter on “yes” Then, select “Manag…

That worked, and now my 5A does boot from the NVME SSD.
Thanks to all who gave advice.

Fred