TXUltimate T5-3C-86 copy flash from another one - device work but can not add to ewelink

I have bricked one of my two T5-3C-86 by flashing a custom firmware.
I tried to recover it by reading the flash from the good one and writing on the bricked one, using esptool.
It works fine, but when I put it in pairing mode and try to add it to ewelink, it find it immediately but fail to add.
I think that ewelink see somehow that the flash is from another device.
Any idea how can I fix this in order to add it to ewelink?

I think eWeLink can’t and wouldn’t answer this topic, nor the SONOFF guys.
From my view, it’s better to ask the ESP community.

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