Here is the Adobe Flash Player App (APK File) from Adobe official website.
Download the above apk file and move it to your cell phone’s storage. and then from your cell phone tap to install it.
I am not sure yet if it will works on Android 4.1.2 Jelly Bean devices. It works fine on Some Samsung tab with Android JB OS with the stock browsers.
After install the ‘install_flash_player_ics.apk’, You may need to check your browser settings to enable the “adobe flash player’ or try to install other browser for mobile phones.
Please let me know if it works on your cell phone.