Belkin RT3200 crash total at attended FW upgrade

i had a Belkin RT3200 up and running and wanted to make my 2nd attended FW Upgrade.
I initiated it and my router do not come back. After trying all known variants i opened it and attache the serial connection.

screen /dev/ttyUSB0 115200

and get this:

there is no power led blinking, only the internet led is lighting

has anyone an idea how to rescue my device?

kind regards, gerald

looks like wrong baud rate ...

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many thanks for the hint - and shame on me ...
for so many tries and the gnd was not connected :frowning:

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