[UPDATE]
I finally found a way to get the device ROM to Android 12 C.66 which appears to be the latest prior to Android 13 hitting the scenes.
- Stock OOS Full Rom 11.2.2.2 (via EDL Mode/MSMTools)
- OTA OOS Full Rom 11.2.10.10 (via OS Local Update)
- OTA OOS Full Rom 12 C.48 (via OS Local Update)
- OTA OOS Full Rom 12 C.65 (via OnePlus “Local Update” utility)
- OTA OOS Incremental Rom 12 C.66 (via OnePlus "Local Update utility)
As exciting as that is for me… still having the issue described in my original post above using the last versions of the Lineage 19.1 dtbo.img and vendor_boot.img from 12/27/22. Specially, flash all 3 img files as instructed and manually reboot into Recovery only to be met with a perpetual 1+ Logo boot screen. It has to be something I am doing wrong or there is a step being missed. Scratching my head big time.
Let me know if anyone has any thoughts on this please.