Downgrading on Stock Rom (OOS)

Source:Android Authority

Warning ⚠️
I)DO NOT DOWNDRADE TO OxygenOS 13 AFTER UNLOCKING BOOTLOADER
II)BEFORE LOCKING BOOTLOADER MAKE SURE TO UNROOT IT
III)YOUR INTERNAL STORAGE WILL BE WIPED

Steps:
  1. Turn on Developer option
    Info! To enable developer option open settings>About Phone>Version> Tap version no 7-8 times. Enter your Password/Pin/Pattern if prompted
  2. Go To About Phone - Tap on Oxygen OS
  3. Tap 4 dots at top and select "Local Install" and select downgrade file.
  4. Tap Install
Warning! Your phone will reboot and all your data will be erased.
Link to the thread: Oneplus Community
Link to OOS 13.1.1.224: Download
Video Guide:

Credit: NordCE3 Community

Pranish

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