I upgraded to Oxygen 12open beta, cant enter to bootloadedr, so I used mtkclient to downgrade Oxygen 11 and then I couldn't boot, black screen and hard bricks, maybe it's anti-rollback, I don't know how to solve it . any one has solution?
"Oxygen Updater" apk has a thread regarding A12 beta , you can download A11 rollback zip file from them but it will get you to A11 indian version .