https://github.com/K58/fix-signal-oneplus13

fix-signal-oneplus13 V3.1
Fix signal and bootloop for OnePlus 13 CN on OxygenOS 15.

Tutorial
How to fix signal
Download and install this module in Magisk (or other root manager).

How to fix bootloop
Finish an OTA System Update, but DO NOT click reboot.

Press "Action" button below the module name in Magisk (or other root manager), make sure the patch is succeed.

You MUST also Install Magisk (or other root manager) to Inactive slot.

For Magisk: Magisk Manager -> Home -> Magisk (Install) -> Install to Inactive Slot (After OTA)
Reboot in System Update

Warning

This module will patch dtbo partition to fix bootloop.
DO NOT lock the bootloader with modified dtbo (or other partition) in any slot.