Hot answers tagged 2.3-gingerbread
Note: Keep in mind, Samsung Galaxy S2 has infamous Superbrick bug. Every flash can result in permanent brick (only board changing or maybe JTAG unit can recover device). You can learn more about it here. Note2 : Last resort to enter Download mode is to get USB JIG. There is plenty of this on Internet and it's very cheap. Also there is tutorials on Internet ...
Sounds like you need to update your Google Play Account and remove the old credit card. From your phone hit Google Play store app, go to your account, go add a payment method, or edit an existing one. Once there delete the old card and add the new one.
Currently the most trustable source for older APK versions is APK Mirror. For Dropbox specifically you can find older 2.x versions here: http://www.apkmirror.com/uploads/?app=dropbox
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