Here are my latest TWRP and OrangeFox recovery builds for N200.
DO NOT FASTBOOT FLASH THESE
You'll have a bad experience and probably won't be able to boot back into your stock ROM until you switch back to a proper boot.img.
Fastboot boot the image then go to advanced settings and "install this TWRP/OrangeFox" (depending on which you're on)
I'm running 18.104.22.168.DE17AA N/A firmware (on my T-Mobile branded variant)
You must remove your lockscreen security (you can re-enable it when you're done in twrp).
If you don't remove your password,pin,pattern,fingerprint you're not going to be able to access your data within recovery.
I'll upload my device tree later today and get threads made.
For me, I can daily driver this to achieve anything I need custom recovery.
The build flags I set should support metro, T-Mobile, and unbranded/NA variant.
I have flashed the latest NA build from the OnePlus website with this project and it switched me from slot A to slot B in the process without an issue
If you encounter issues (aside from decryption because your have a password set), I'll do my best to resolve them