Super Flasher 15R EU 16.0.10.500.zip
9bd096f3f7e2c890784a48a7e81921c25eacd89a2db236099dff4e73743a3d18Integrity
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OnePlus 15 · Chinese hardware
If you have a Chinese OnePlus 15 that was converted to OxygenOS and the bootloader was locked again, I strongly recommend restoring bootloader/Fastboot access now while the free method is still available.
You do not need to unlock the bootloader afterward. The important part is restoring access to the real bootloader/Fastboot mode.
If your device is affected, do this sooner rather than later.
Huge thanks to mikoker for discovering this method.