Incident: Precision Cooker Pro dead after an interrupted OTA update¶

Unit¶


Model	Anova Precision Cooker Pro, type AN600-20 (EU, 220-240 V)
Serial number	AN600-EU10-… (withheld in the public repo)
Warranty	expired
History	Worked normally until the update. Never dropped, opened or damaged.
Update path	Anova app 3.6.7 on a Pixel 10 Pro XL

Date	Event
~28/29 Oct	Firmware update started from the Anova app. Progress stalled at 75%. Left plugged in overnight, it never finished.
29 Oct (morning)	Unplugged, rested 2 h, plugged back in: no beep, no display, no LEDs.
29 Oct	Support ticket #… (number withheld) opened. Anova suggested leaving it plugged in overnight.
30 Oct	Overnight power-on made no difference. Still completely dead.
1 Nov	Anova: out of warranty. Offered 10% off a new unit.
1 Nov	Asked Anova for (1) a signed firmware image + recovery instructions, (2) a replacement main board at the owner's cost, (3) a mail-in reflash, or (4) a refurbished unit. Started this project in parallel.
1 Nov	Head opened (glass cut free, 4 screws). Main board photographed; chip markings read. See photos.md.

The exchange with Anova support, word for word with names and identifiers removed: correspondence.md.

"Completely dead" means not even the power-on beep. That points to one of these:
the MCU that drives the UI/buzzer never starts its application
a logic supply rail is missing
the UI MCU is waiting in a ROM bootloader state
The CC3220 OTA mechanism should roll back an uncommitted image after a reset. This unit did not recover, so either:
the update touched something without rollback (service pack, a second MCU, the filesystem metadata), or
the failure is not in the CC3220 image at all.