Issue: The FRITZ!OS update fails with the message "An unspecified error occurred during the update. (5)". Remedy: The specified file is no update file. It could be the fritzbox-*-lab*.zip file, which contains the lab update file. Unzip the downloaded ZIP archive before starting the update and select the lab update file from the unzipped files (FRITZ!Box-Lab-xxxx.image). Detailed instructions for...
> https://en.avm.de/fritz-lab/fresh-from-development/known-issues/