How to Update Galaxy S3 with Jellybean 4.2.2 Thunderbolt Custom ROM Firmware
For your convenience, we have also summed up a detailed feature list, a video tutorial on how to apply this firmware in your S3 along with the screen captures on how this custom ROM firmware looks like after installing in your S3.
All the data present in your device should be backed up with the help of below mentioned steps so as to make sure that just in case if the data gets lost or corrupted, the same can be restored with the help of below mentioned steps. Don’t backup the data with ROM Manager as it may brick the device and also don’t backup the data with the help of KIES as it may not detect the device in the custom ROM firmware.
SMS – Use “SMS Backup & Restore app”,
Contacts – Sync with the Gmail application,
Call Log –Call Log and Restore
Images, Songs, Videos, Files – Copy to internal / External SD Card,
APN and MMS Settings – Note down from the path “Applications > Settings > Wireless and Network > Mobile Networks > Access Point Names”
For installing this update you will have to make sure that your device is rooted. Also, disable all the antivirus suites installed in your phone as these tools generally interrupt the process of firmware update.
For checking on whether your device is rooted or not, you will have to download the “Root Checker” app from the Google PLAY Store. Just in case if your Galaxy S3 isn’t rooted, with the help of below steps you will have to root the same.
So assuming that you are done with the above mentioned steps, you can now head over to the next page where we have summed up a detailed guide on how to apply this firmware update in your device.