Stuck in boot loop after update

Basic Information:

Printer Model: Ender 3 V2
MCU / Printerboard: Creality 4.2.2
klippy.log Can’t get this - see below

Fill out above information and in all cases attach your klippy.log file. Pasting your printer.cfg is not needed
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Describe your issue:

I just switched from a Pi 3B+ to a 4B 2GB. Klipper booted perfectly and Mainsail loaded perfectly (after changing my bookmark to the new Pi’s IP). I saw there was updates because I hadn’t run it in a month or so so I hit update. Now it’s stuck in a boot loop. The last line I see on the screen is “Klipper Login:” then it goes to a black screen with a cursor top left then back and forth. Mainsail won’t connect, can’t SSH in via IP (thus no klippy.log).

Any ideas? TIA

I have this same issue on a Voron 2.4 after updating all my packages- was there any fix?

So after some troubleshooting the Sonar application was restarting my WiFi connection in a loop. I ran sudo systemctl stop sonar and have access to the Pi again.

There was a fix but I don’t remember what it was lol. Sorry!