Device ID Masker v3.0 is released with Android 11+ support, also Pro/Unlocker are updated with Android 11+ support, you need to update those as well!
Changelog :-
v3.0 (16/Aug/2021)
– Added support for Android 11 and above.
– Removed WiFi Hook option from settings, as google restricted wifi mac address from Android 6, apps generally wont get MacAddress so workaround way is removed from hooks.
– Fix force close on some firmwares.
– Bugs fixed.