Gosund EP2 firmware 1.0.6 flashing tasmota-minimal 12.3.1 - successfully flashed, but dead afterwards

[rudelm]

Hi,

I've used a Raspberry Pi3 and its internal Wifi on Raspbian release 2022-09-22. The installation process of tuya-convert went fine and without problems. I've replaced the original tasmota.bin with https://github.com/arendst/Tasmota/releases/download/v12.3.1/tasmota-lite.bin which is the latest version 12.3.1 and came from version 1.0.4 which was updated by the Gosund support to 1.0.6 so I could flash Tasmota.

I've connected during the process with my iPhone to the VTRUST Wifi and was shown a wifi portal message that I'm connected, without being forwarded from that page.

I was able to get my two plugs connected to the pi and flashed successfully the image. It even created the backup images fine. But after a while no new Wifi network was visible. I've plugged them in and out and pressed the power button, but I was unable to get any reaction. The only thing that happens is during plugging it in is a short green LED flash. Besides that they appear both to be dead.

What are my options now? Cracking the case open to solder a direct connection to the board, trying a direct recovery?

Here's the output from my flash process:

`TUYA-CONVERT

https://github.com/ct-Open-Source/tuya-convert TUYA-CONVERT was developed by Michael Steigerwald from the IT security company VTRUST (https://www.vtrust.de/) in collaboration with the techjournalists Merlin Schumacher, Pina Merkert, Andrijan Moecker and Jan Mahn at c't Magazine. (https://www.ct.de/)

====================================================== PLEASE READ THIS CAREFULLY!

TUYA-CONVERT creates a fake update server environment for ESP8266/85 based tuya devices. It enables you to backup your devices firmware and upload an alternative one (e.g. ESPEasy, Tasmota, Espurna) without the need to open the device and solder a serial connection (OTA, Over-the-air). Please make sure that you understand the consequences of flashing an alternative firmware, since you might lose functionality!

Flashing an alternative firmware can cause unexpected device behavior and/or render the device unusable. Be aware that you do use this software at YOUR OWN RISK! Please acknowledge that VTRUST and c't Magazine (or Heise Medien GmbH & Co. KG) CAN NOT be held accountable for ANY DAMAGE or LOSS OF FUNCTIONALITY by typing yes + Enter

yes Checking for network interface wlan0... Found. Checking UDP port 53... Occupied by dnsmasq with PID 2574. Port 53 is needed to resolve DNS queries Do you wish to terminate dnsmasq? [y/N] y Attempting to stop dnsmasq.service Checking UDP port 67... Available. Checking TCP port 80... Available. Checking TCP port 443... Available. Checking UDP port 6666... Available. Checking UDP port 6667... Available. Checking TCP port 1883... Occupied by mosquitto with PID 2956. Port 1883 is needed to run MQTT Do you wish to terminate mosquitto? [y/N] y Attempting to stop mosquitto.service Checking TCP port 8886... Available.

Starting AP in a screen..... Starting web server in a screen Starting Mosquitto in a screen Starting PSK frontend in a screen Starting Tuya Discovery in a screen

======================================================

IMPORTANT

1. Connect any other device (a smartphone or something) to the WIFI vtrust-flash This step is IMPORTANT otherwise the smartconfig may not work!
2. Put your IoT device in autoconfig/smartconfig/pairing mode (LED will blink fast). This is usually done by pressing and holding the primary button of the device Make sure nothing else is plugged into your IoT device while attempting to flash.
3. Press ENTER to continue

====================================================== Starting smart config pairing procedure Waiting for the device to install the intermediate firmware Put device in EZ config mode (blinking fast) Sending SSID vtrust-flash Sending wifiPassword Sending token 00000000 Sending secret 0101 ................ SmartConfig complete. Resending SmartConfig Packets ............................................................................................................. IoT-device is online with ip 10.42.42.42 Fetching firmware backup % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 1024k 100 1024k 0 0 61428 0 0:00:17 0:00:17 --:--:-- 28953

Getting Info from IoT-device VTRUST-FLASH 1.5 (c) VTRUST GMBH https://www.vtrust.de/35c3/ READ FLASH: http://10.42.42.42/backup ChipID: 5df024 MAC: 48:55:19:5D:F0:24 BootVersion: 7 BootMode: normal FlashMode: 1M DOUT @ 40MHz FlashChipId: 14325e FlashChipRealSize: 1024K Active Userspace: user1 0x01000

Ready to flash third party firmware!

For your convenience, the following firmware images are already included in this repository: Tasmota v8.1.0.2 (wifiman) ESPurna 1.13.5 (base)

You can also provide your own image by placing it in the /files directory Please ensure the firmware fits the device and includes the bootloader MAXIMUM SIZE IS 512KB

Available options: 0) return to stock 1) flash espurna.bin 2) flash tasmota.bin q) quit; do nothing Please select 0-2: 2 Are you sure you want to flash tasmota.bin? This is the point of no return [y/N] y Attempting to flash tasmota.bin, this may take a few seconds... Flashed http://10.42.42.1/files/tasmota.bin successfully in 22332ms, rebooting... Look for a tasmota-xxxx SSID to which you can connect and configure Be sure to configure your device for proper function!

HAVE FUN!

Do you want to flash another device? [y/N] y

IMPORTANT

1. Connect any other device (a smartphone or something) to the WIFI vtrust-flash This step is IMPORTANT otherwise the smartconfig may not work!
2. Put your IoT device in autoconfig/smartconfig/pairing mode (LED will blink fast). This is usually done by pressing and holding the primary button of the device Make sure nothing else is plugged into your IoT device while attempting to flash.
3. Press ENTER to continue

====================================================== Starting smart config pairing procedure Waiting for the device to install the intermediate firmware Put device in EZ config mode (blinking fast) Sending SSID vtrust-flash Sending wifiPassword Sending token 00000000 Sending secret 0101 ............... SmartConfig complete. Resending SmartConfig Packets ........................................................................................................ IoT-device is online with ip 10.42.42.42 Fetching firmware backup % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 1024k 100 1024k 0 0 61954 0 0:00:16 0:00:16 --:--:-- 28379

Getting Info from IoT-device VTRUST-FLASH 1.5 (c) VTRUST GMBH https://www.vtrust.de/35c3/ READ FLASH: http://10.42.42.42/backup ChipID: 50ee54 MAC: 48:55:19:50:EE:54 BootVersion: 7 BootMode: normal FlashMode: 1M DOUT @ 40MHz FlashChipId: 14325e FlashChipRealSize: 1024K Active Userspace: user1 0x01000

Ready to flash third party firmware!

For your convenience, the following firmware images are already included in this repository: Tasmota v8.1.0.2 (wifiman) ESPurna 1.13.5 (base)

You can also provide your own image by placing it in the /files directory Please ensure the firmware fits the device and includes the bootloader MAXIMUM SIZE IS 512KB

Available options: 0) return to stock 1) flash espurna.bin 2) flash tasmota.bin q) quit; do nothing Please select 0-2: 2 Are you sure you want to flash tasmota.bin? This is the point of no return [y/N] y Attempting to flash tasmota.bin, this may take a few seconds... Flashed http://10.42.42.1/files/tasmota.bin successfully in 21907ms, rebooting... Look for a tasmota-xxxx SSID to which you can connect and configure Be sure to configure your device for proper function!

HAVE FUN!

Do you want to flash another device? [y/N] n

Cleaning up... Closing AP Exiting...`

[rudelm]

Looks like this is almost "normal" for this device https://github.com/arendst/Tasmota/discussions/10350 regardless if I use the latest Tasmota or the one that's part of tuya-convert. A larger amount of plugs ends up bricked after OTA updates. Cracking the case open seems very destructive so I'll guess these plugs are now broken.

[TrustedFloppa]

you should have used default by tuya-convert image now you have to serial reflash it

[rudelm]

OK, I've got two other EP2s converted to 1.06 which I will try with the tasmota image part of this repo.

Are there any known limitations with newer tasmota versions that would hinder a direct flash to the latest version? this might justify a small note in the readme.md to not update the image file and to do later update attempts manually via Tasmota UI.

[rudelm]

Maybe the tasmota image I've used doesn't fulfill these requirements:

Binary requirements:

full binary including first-stage bootloader (tested with Arduino eboot and Open-RTOS rBoot)
maximum filesize 512KB for first flash

I could now update the two EP2 plugs with the default image from the repo.

[TrustedFloppa]

I have EP2 sockets with flashed tasmota using tuya-convert and I updated from 9.t.0 to lastest one

[rudelm]

yeah was also able to flash it that way. Tried first the lite image, as the tuya-convert was also a lite image and tried then the regular sized tasmota image. That's how I was used to update my existing Gosund SP1.