When did release the os 11 for OnePlus 7....????
Who told you it did ?
OnePlus DIDN'T release OOS 11 for OnePlus 7. Maybe you misinterpreted it?
Please use the search before creating a new thread, there are similar threads already open and answered.
Oxygen os 11 is still under development for your device model by OnePlus. It will be released when it is ready.
Please read and use this thread for further discussion
Binge with OnePlus TV: April 2021
by Sarah P., 2021-04-15