OPPO R9s (R9s) for /e/OS-a14 3.x
Custom build with fewer apps.
e-3.1-a14-20250715-CUSTOM-R9s.zip
https://sourceforge.net/projects/eosbuildsronnz98/files/OtherSmartphones/e-3.1-a14-20250715-CUSTOM-R9s.zip/download
Please see sources and further information here, I don’t have install instructions tough:
https://xdaforums.com/f/oppo-r9s-r9sk-r9st-r9skt-cph1607.12946/
Use it at your own risk!
Please support the developer(s)!