I hadn't used my PW4 in a while - it was just running stock firmware in the end (but I had previously tinkered a bit).
Now it won't boot past the 'boy under a tree' splash screen, and it doesn't go in to USB mode.
Closest I've seen is when it's dead flat I can see a 'drive' but nothing mounted in it.
Looks like I'm on one of the firmware versions that doesn't allow entering recovery mode from a serial connection anymore(!).
Is there any way to force it to mount the storage so I can manually apply an update?
https://pastebin.com/J4Nhkadj
It'd be a real bummer to send it to landfill over a software issue.