Well I will probably reinstall UT on my other one+ 6 phone(which is stuck on boot screen) and slowly migrate my settings to that phone. Well thank you all for participating.

Hello, I meet difficulties to flash the recovery on oneplus6. I notice that in can't flash the recovery using fastboot flash recovery file.img But, it works using : fastboot flash boot file.img If you comes from any linuxOS (PostmarketOS or Mobian), flash the dtbo too. It works with the one of /e/OS (https://images.ecloud.global/community/enchilada/) you found it in the recovery zip file. Using this way, i came back from mobian to OxygèneOS... And Ubuntu touch !