ZBT we826-32m no reboot

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By any chance, do you have any idea about this@

ZBT WE826-32M flashing of firmware mtd partition causes bricking

Hello, in the past, we used to back up the firmware partition and the flash it on new routers: dd if=/dev/mtdxx of=/tmp/art.bin (where mtdxx is the firmware partition) We get the image of 31.7M but flashing it via the " Firmware Recovery Mode" causes the WE826-32M to "brick"? Any idea how to fix this or how to get a copy of the existing firmware and flash it to new routers? Thank you