Oxnas rootfs will not boot on Pogoplug Pro (no replies)

I have a Pogoplug Pro that I ran for years. I haven’t used it in the last couple, but I dusted it back off today. It was previously running Debian Buster on the latest uBoot. Pluging it back in, I was not able to SSH into it. I tried using the most recent rootfs since I was planning to repurpose the device anyway and wanted to start from a clean slate and get on the latest OS.

Working through the instructions here: https://forum.doozan.com/read.php?2,16044,page=1 I am still unable to access the box via SSH. I’ve done the installation process twice on my USB drive and it seems to go without a hitch (the first time I skipped step 4, and the second time I did step 4… I’ve run this box for years so I read it as “I don’t need to do that step”). I also recently upgraded a Pogoplug Mobile (v4) without any issue.

I don’t have netconsole or a serial connection on the Pogo Pro unfortunately.

When I plug the fresh rootfs in, and power it on, the light alternates between solid yellow, a series of a couple/few yellow rapid flashes, then exactly 6 slower orange flashes.

I’m not sure what I’m missing here and why this box would cease to boot. At first (with the old buster installI thought it was because I had a network drive in fstab and I removed that. Still no luck.

Thanks for any ideas.