Shelly Plug US Gen 2 to Tasmota fails halfway

[spockatieee]

Hi. I'm trying to transition a Shelly PlugUS Gen2 (Shelly firmware 1.4.4) to Tasmota32 using the Sep 30 version of the PlugUS zip file.

I followed the README instructions, and got as far as generating the Autoconf for the Shelly Plug US, while booted into Tasmota 12.5.0 Solo1. While I did have a bricked moment, doing OTA on local network with the mgos32-to-tasmota32 revived the Shelly and brought me back into Tasmota 12.5.0 (supposedly with the locked bootloader).

The next step, clicking on the Partition Wizard, just hangs. Looking at the console, these are the Berry errors that are generated (tried setting as high as WebLog 5, but no difference):

BRY: Exception> 'type_error' - unsupported operand type(s) for <=: 'nil' and 'int'
stack traceback:
: in function factory_migrate_eligible
: in function show_migrate_to_factory
: in function page_part_mgr
: in function <lambda>

Any clues on what may be wrong here?

Thanks!

More details from the Tasmota Information page:

Shelly Plug US

Tasmota

Program Version	12.5.0(solo1)single-core
Build Date & Time	2023-04-17T08:07:06
Core/SDK Version	2_0_7/4.4.4.20230218
Uptime	0T00:06:52
Flash Write Count	27
Boot Count	10
Restart Reason	Software reset CPU
AP1 SSId (RSSI)	XXXXXXXX (100%, -48 dBm) 11n
Hostname	tasmota-XXXXXXX
IPv6 Global (wifi)	XXXXXXXXXX
IPv6 Local (wifi)	XXXXXXXXXX
MAC Address	XXXXXXXXXX
IP Address (wifi)	192.168.X.XX
Gateway	192.168.X.X
Subnet Mask	255.255.255.0
DNS Server1	192.168.X.X
DNS Server2	0.0.0.0
HTTP API	Enabled
MQTT Host
MQTT Port	1883
MQTT TLS	Disabled
MQTT User	DVES_USER
MQTT Client	DVES_XXXXXX
MQTT Topic	tasmota_%06X
MQTT Group Topic 1	cmnd/tasmotas/
MQTT Full Topic	cmnd/tasmota_XXXXX/
MQTT Fallback Topic	cmnd/DVES_XXXXXX_fb/
MQTT No Retain	Disabled
Emulation	None
ESP Chip Id	1248352 (ESP32-U4WDH-D rev.3)
Flash Chip Id	0x164020 (DIO)
Flash Size	4096 KB
Program Flash Size	0 KB
Program Size	1518 KB
Free Program Space	1600 KB
Free Memory	158.3 KB (frag. 17%)
Partition app_0*	1600 KB (used 94%)
Partition fs	384 KB
Partition app_1	1600 KB
Partition fs	384 KB

[Jason2866]

Only serial flash is the way out. There are 3 boot attempts when a not Shelly signed firmware is installed (with the Shelly bootloader) until it always starts the firmware at address 0x10000. The Autoconfiguration step does replace the Shelly bootloader against a bootloader without firmware sign checks. So if not done the Autoconfiguration step or this fails for whatever reason -> Serial Flash
Updating to a newer Tasmota firmware needs starting a firmware from a different address than 0x10000

[spockatieee]

I see. So serial flash to another mgos32-to-tasmota32, just the bootloader, straight to factory Tasmota, or something else?

[Jason2866]

When serial flashing, directly flash Tasmota. No other step needed.