Step 1: Download the Android Jelly Bean 4.1.1 ROM for your Kindle Fire. It’s around 108MB, so may take a little while if you’re on a slow connection. Download link at the official XDA thread below.
Step 2: Download Gapps, which you’ll also need to flash onto your device. Download link at the official XDA thread below.
Step 3: Power down your device, and boot into recovery.
Step 4: Flash the ROM/Gapps you downloaded in the first two steps from ClockworkMod Recovery, and make sure you do a complete wipe of the data and cache.
Warning: This will delete your personal data, so ensure everything is backed up.
Step 5: That’s it. Simply restart your device from CWM and your Kindle Fire should now be running Android Jelly Bean 4.1.1, and if you find you cannot connect to Wi-Fi after flashing, you simply need to adb shell su fix-mac.sh and you should be good to go.
