Tasmota Sonoff ZigBee Bridge - Flash Zigbee module

I’m stuck at Flashing the Zigbee module on my sonoff zb bridge.
when installing the firmware i get an error:

01:35:07 HTP: Firmware Upgrade
01:35:15 CFG: Saved to flash at FB, Count 42, Bytes 4096
01:35:15 UPL: File ncp-uart-sw_6.7.6_115200.ota …
01:35:15 UPL: File type 4
01:35:19 UPL: Successful 190272 bytes
01:35:19 HTP: Upload transfer
01:35:19 XMD: Init bootloader
01:35:50 XMD: Bootloader timeout
01:35:50 XMD: Restarting
01:35:51 HTP: Upload done

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