OnePlus Pad 2 Pro / OnePlus Pad 3 (erhai) for /e/OS-a15 3.1.4
e-3.1.4-a15-20250928-UNOFFICIAL-erhai.zip
https://sourceforge.net/projects/eosbuildsronnz98/files/OnePlus/OnePlus%20Pad%203/e-3.1.4-a15-20250928-UNOFFICIAL-erhai.zip/download
These device is now officially supported by LineageOS.
Please see sources and install instructions including recovery here:
https://wiki.lineageos.org/devices/erhai/variant2/
Use it at your own risk!
Please support the developer(s)!