"press any key to shutdown" after successful flash

[adeebshihadeh]

We've had two cases now of good devices getting flashed all the way to the success screen, then end up on "press any key to shutdown."

#1 trey during EPHOT

• flashed an EPHOT mici with 435fa2d
• ended up with "press any key to shutdown"
• changed cable, flashed again, and it was fine

#2 Apolloyaya on Discord

• flashed a good comma four with 4e577e1
• immediately ended up with "press any key to shutdown"
• flashed 2x more time with same version
• tried this a few things on bump qdl.js #184, same result
• debug dump after a few attempts on the branch dump.txt
  • slot is marked as unbootable, unclear why it's not reproducible or deterministic though
• update: fixed after changing cables and reflashing with bump qdl.js #184 on b3186ab

Alright we got it successfully flashed. It was the usb-c cable but it was not the data one. Turns out my pc usbc doesn't supply sufficient power for the comma four to survive the reboot after flash. after I plug the power source into a 30w charger and reflash, it went through and boot into setup screen.

---

Similarities between both cases:

• comma four (though this shouldn't make a difference)
• core flashing code is the same for the initial bad flash
• fixed with a reflash, though case replace zero chunks with ChunkType.skip #2 had different flashing code on the good reflash

First order of business is to add a bunch of local and remote logging:

• setup sentry (or some other platform)
• log GPT headers and other metadata before any write ops
• log same metadata right after flashing but before reboot