Not a OnePlus user but is this what you are looking for ? https://community.oneplus.com/thread/1196577828310089728
Almost, this seems to contain the rollback from Android 13 to Android 12. I cant find any article about rolling back 14 to 13.
Doesn't the Lineage guide link the firmware needed for the rollback?
It only states that the necessary firmware can be found on the manufacturers page
The steps to do soo are not hard tho.
You just need the android 13 firmware this one: https://oxygenos.oneplus.net/8173_sign_LE2111_11_F_OTA_2290_all_nRBuNP_00011011.zip
Then enable developers options by tapping "Build Number" 7 times
Enable Usb debugging in the developers options.
Then go to About device > Up to date, 3 dots on the top right and click local install.
Then select downgrade firmware, Extract > Upgrade
If the local install button is greyd out just follow the steps in this guide: https://droidwin.com/local-install-greyed-out-in-oneplus-how-to-fix/
The process itself is not hard no. I just could not find the firmware required.
How and where did you find that link?
There are some on this link right here https://service.oneplus.com/global/search/search-detail?id=2096329&articleIndex=1
And there is a tool to fetch updates like your phone does
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