WIFI card replacement Librem13v1 + Coreboot

I’m the owner of a Librem 13v1, one of the first models. The device still covers my needs perfectly, there is just a problem I can’t resolve: the WIFI does not work since I installed Coreboot (the laptop was shipped with proprietary firmware in 2016), the wifi never worked again. I tried everything (and had a long e-mail thread with Support) so I’m NOT expecting to solve the problem anymore, I just would really appreciate a recommendation for a wifi-card replacement which works fine with the Librem 13v1 and Coreboot, if someone has a similar setup working.

Thanks a lot in advance.