pi 3+ won’t read SD card after upgrade

i know that some people have had issues doing big version jumps through the online upgrade.

might be worth downloading the sd image and doing a fresh install.
 
Prior to v6.something, you often needed to do the FPPOS upgrade twice for it to work successfully..
I just attempted a 5.3 to 9.4 in-place, didnt go particularly well. Luckily it was a burner system so it didn't matter.

Keep in mind, you're also jumping two versions of the underlying OS, from Debian 10 to Debian 12 in that change as well.
 
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