When upgrade my application to beta 14 on devices with android version 2.3 i have this error:
02-05 16:22:26.445: D/CordovaLog(14066): file:///android_asset/www/js/libs/ionic/js/ionic.bundle.js: Line 23905 : Uncaught SyntaxError: Unexpected token finally
On android 4.x there is no problem.
Well, they explicitly state that there is no support for older devices:
Ionic is also not a good solution if you need to support older generation devices. Our compatibility starts at iOS 6 and Android 4.1. We will never support versions earlier than those. This is a framework for the future.
ups! nice notice
Define me future? 
thks