Installation Guide For OnePlus 6T/6t (fajita,enchilada)
Rom by default encrypted
Download OOS 11 : https://oxygenos.oneplus.net/OnePlus6TOxygen_34.J.62_OTA_0620_all_2111252336_f6eda340d7af4e3e.zip
Download Cherishos Rom : https://sourceforge.net/projects/cherishos-oneplus6-6t/files/
Download A12 TWRP Zip : https://sourceforge.net/projects/oneplus-6-series/files/A12%20TWRP
Boot A12 TWRP Img Using Fastboot
Install OOS11.zip + CherishOS+ Finalize+ A12 TWRP.zip
Go Wipe > swipe right"normal wipe"
Reboot Recovery again
Go Wipe > Format Data > Type "Yes"
Reboot System