Tuya-based Switch bricked

[bastian987]

<<<<<<< HEAD

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• [x ] Searched the problem in issues (https://github.com/arendst/Sonoff-Tasmota/issues)
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• [x ] Hardware used : Jinvoo Smart Switch 2
• [x] If a pre-compiled release or development binary was used, which one? :https://github.com/stefanbode/Sonoff-Tasmota/tree/master/bin/firmware_sonoff.bin
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I'm currently installing electric shutters and therefore tried out a Jinvoo Smart Switch with this cool Tasmota fork. The switch is Tuya based (https://docs.tuya.com/en/hardware/WiFi-module/wifi-e3s-module.html), I could flash standard tasmota with tuya-convert and all seemed to work fine. I could also flash the minimal version of this stefanbode fork, but the full version seem to have bricked the device: when plugged in, the LED flashes quickly, the switch can no longer be accessed in the browser, it does not connect to the wifi.

Is this issue known already, can it somehow be fixed?

(I don't worry about the switch, I am well aware this is experimental)

[stefanbode]

No, this version is 99% the same like the original one. I try to change as minimal as possible. Therefore the behavior is unusual but it was already reported one time, but not reproduceable. If connecting serial you should be able to flash in any case. Check if there is a WiFi opened by the device.

[bastian987]

Thanks for the quick reply, it solved the issue for me! Actually, a sonoff-xxxx WiFi was opened, I could connect, enter the Wifi credentials and configure the device. I'm new to Tasmota and didn't expect the credentials are overwritten -- I'm sorry. Thanks again, I'm now looking forward to awesome shutter control :)

In case somebody else tries this: I used the following configuration for the Jinvoo Smart Switch Dual 52,0,0,18,22,0,0,0,17,21,0,0,0 (put this in modify template, then select the created template in configure module).

[stefanbode]

The issue is that my config definition is a bit larger than the original one and need some more bytes. The new algorithm for detecting errors reject a new flashed device because of the wrong checksum and bring it back to default. Since now I haven’t found a suitable way for me to overcome this new check.