New rock pi - only with nvme ? no eMMC and no uSD - any chance to install?

Hello out there!

my rock pi arrived today!

  • Rock Pi 4 Model A 4G Starter Kit
  • M.2 Extend Board
  • Samsung 970 Evo m2 250GB NVMe

Now I wanted to install the rock pi.
But did I understand correctly that this is not possible without uSD or eMMC?

So here I have only the m2 extension board + one m2 250GB ssd?

Can somebody tell me what is going on?

thx