If you have upgraded to Jelly Bean, and do not have Adobe Flash, check out the following guide on how to install Adobe Flash on your Android 4.1 Jelly Bean device:
- Download the Adobe Flash Player .apk file
- Download flash_player version 11.1.102.59.apk
- Copy the files to your device SD card
- Locate the file using a file manager eg: ES Explorer
- Install and run a browser of your choice eg:Dolphin Browser
- Go to Settings on your browser and change Flash settings to suite your preference
[NOTE] It is important to remember that Adobe doesn’t official support Flash on Android 4.1 Jelly Bean. So you may experience laggy or buggy behavior when viewing flash content.
source – XDA Developers