Instructions:
- Be on OOS 13.1.0.581 or .582 firmware with an unlocked bootloader
- Have the OnePlus/Qualcomm fastboot and the latest Google ADB Interface drivers installed, along with the latest official Android SDK Platform tools
- Download the recovery, boot it with "fastboot boot path/to/recovery.img"
- Navigate to adb sideload with the volume keys and press the power button
- Run "adb sideload /path/to/aospa.zip"
- Wipe data using the volume and power keys if coming from another rom...