He Jimmy,
I took the risk of using the MSM method to reinstall the whole andriod system and it worked. I now have a working phone with Android 105.2. Stil no /e/ OS but at least it’s unbricked. In fact it was not that much work, but I had to read a lot before starting. If you want to do thius, it may be wise to read the posts about it in this thread: Oneplus Nord manual installation problems - #37 by aibd
And read these two guides: Guide to Unbrick OnePlus Nord from a Hard-Bricked State using MSMDownload Tool
OnePlus Community
The first read is clear, but the oneplus community thread gives some extra info and explains a few things that are left out in the customdroid guide. I would ask aidb for some advise before doing this, but good luck!