Never buy a OnePlus phone ever again. They now have a hardware anti-rollback fuse that blows if you revert to an earlier version or install a custom ROM.

https://consumerrights.wiki/w/Oneplus_phone_update_introduces_hardware_anti-rollback

Oneplus phone update introduces hardware anti-rollback

Consumer Rights Wiki
@davidgerard hmmm I wonder if this is related to the return of OnePlus to parent company @Techaltar or maybe just the classic enthusiast brand growth/betrayal you talked about