Hi Rikard,
See https://community.teltonika.lt/t/fw-7-11-cant-edit-wireguard-peer-in-web-interface/10672 for details about that. EligijusG contribute a lot.
Re-reading the Teltonika answer, the ‘without keep setting’ update is only needed for 7.14.1 → 7.14.2 if I understand it correctly. 7.14 → 7.14.2 can be done issuing a cmd first.
But I wait a bit till the dust settless.
Good luck with restoring your systems, le us know how you fare!