Finally I have done and successful downgraded my airtel Xtreme stb and enable usb debugging and remove the fuking app. LolI have 2 airtel boxes first is updates disabled usb debugging try 10 times remove power cable trick but not working won't downgraded
And another one is old version patch level 2019 and i successfully converted it to fully android box
So what I do with it
First must enable usb debugging and open yr phone hotspot but do not turn on internet otherwise yr box will be updates to latest version after that connect yr box wifi with yr phone and connect it with remote adb shell app via ip address and remove this
com.airtel.tv
com.firmware.update
com.technicolor.checkota
com.uei.uas.airtel
com.apps.updater
com.tataelxsi.icx
com.technicolor.enableUpdates
After success install atv launcher with es file explore appAnd someone who actually downgraded his airtel box please reply
So what I done with is first you have to go airtel Xtreme app permission turn on of toggle of camera open play store and install zank remote app and many kinds of file explorer atv launcher and many as you wish you did not see open button but don't worry you just need to fiil yr box storage after turn of yr internet connection 10 times remove power cable trick actually working but i modified it 15 time remove power when intlaizing and 15 time remove power cable immediately then check and surprise my boot logo change means downgraded leave it 20 minutes and when I realise all set factory reset and connect lnb cable boom downgraded
Note carefully after downgraded don't connect to internet first remove all app via adb server read my pervious post if you want to use it as a airtel Xtreme box don't remove airtel Xtreme app just disable it and use atv launcher but if you permanently want to make it android box uninstall it via server