BTW you may need to have 2 packages of build-tools installed like: google-android-build-tools-34.0.0-installer and google-android-build-tools-33.0.0-installer Then try to upgrade, without this change it should not be possible.
BTW you may need to have 2 packages of build-tools installed like: android- build-tools- 34.0.0- installer and google- android- build-tools- 33.0.0- installer
google-
Then try to upgrade, without this change it should not be possible.