stands for Mobile Station Modem . In the context of the OnePlus 9, the "MSM Tool" refers to a specialized software utility used to flash the device’s firmware at a low level.
For many smartphones, this spells the end of the road—or an expensive trip to a service center. However, for the OnePlus 9 (codenamed Lemonade ), there is a lifeline: the .
completely. Press and hold both the and Volume Down buttons simultaneously, then connect the phone to your PC while holding them.