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@Poltos, Just wanted to report that I have had the hardest time upgrading both the uzb and the razberry to 5.39 firmware. I don't remember these issues with previous firmwares but I may have needed a couple of retries. The failure occurs at seemingly completely random times during the upload to nVME with a message showing ACK return error. I saw the same error on uzb, razberry on a rPi, and on x64.

Upgrade succeeded at the end but after 40-50 attempts on multiple machines.

I have one log attached.

Ohhh that's why my update crash yesterday too

Are you sure you turned off Z-Way? May be something else was trying to communicate with the dongle at the same time?