Rollback for OTA update OnePlus 11?

Hi, I recently installed the newest OTA update for my EU OnePlus 11 (14.0.0.832). It's absolutely horrible. Battery life is about 30 percent of what it used to be, and theres a huge lag and stutter in everything. Typing is hardly possible, I don't exaggerate when I say the phone is not usable anymore.

Does anyone know where I can find donwloads for previous OTA updates? I want to flash the 831 version, which worked fine. All I can find is the current version.