An unofficial build of the TWRP is available for the OnePlus 6. It’s currently in Beta mode but most of the operations are functional. All credits go to @wuxianlin on xda.
For Installing TWRP Recovery on your OnePlus your bootloader needs to be unlocked.
I’m not responsible if you get screwed up with your device.
- Download required files from Downloads section
- Unlock the bootloader.
- Reboot to bootloader.
- Boot into TWRP:fastboot boot recovery-xx.img
- Change Partition slot using TWRP: [Reboot => Change_Slot]
(for example, if you’re in slot A, change it to slot B and vice versa)
- Flash twp-installer zip.
- Flash Magisk (use latest) for root access (optional).