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Installation:
1. fastboot boot twrp.img
2. copy that same twrp image to the device
3. go to Advanced > Install Recovery Ramdisk
4. select the image you copied
5. after that is done, if you were using a custom kernel, reflash it now
6. if you were using magisk, reflash it now
7. reboot to recovery, you should now be able to boot TWRP normally using Power+volume up