Problems with the Thingy-91 firmware-update

Hi, I'm having problems with the firmware update of the Thingy-91.
I received it from my professor to use for my final project (it has already been used by previous students).
However, when I want to write the file to the Thingy-91 in the programmer in nRF Connect for Desktop, it says that the transport was opened successfully, but after a few seconds I get the error message listed.
I've already tried many options but nothing works. Do any of you know what the problem could be?

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