Update Galaxy S3 SPH-L710 Sprint to Android 4.2.1 CarbonRom Custom Firmware

The device that we will use this next tutorial on is Samsung’s Galaxy S3 SPH-L710 (Sprint version). By the end of this post it will feature an update to Android 4.2.1 CarbonRom Sprint custom firmware.

This tool, though, is not an official one. But, apart from a couple of minor bugs (at least, that’s what we experienced), it won’t do serious damage to your phone.

Requirements

The Galaxy S3 L710 must first be rooted and the data on it must be backed up (which includes Internet settings and installed apps) USB Debugging should be turned on, the battery needs to be charged if empty, a custom recovery image needs to be installed (choose either TWRP or CWM Recovery) and the appropriate USB drivers for this device have to be installed on your laptop.

Then download CarbonRom 4.2.1 Jelly Bean ROM (the file is also labelled Carbon-JB-v1.0-06FEB2013-162137-d2spr.zip) and GApps package (this version of the file is called gapps-jb-20121212-signed.zip). Our guide starts below.Galaxy-S3-SPH-L710-sprint

Important instructions

  1. With the help of the USB cable belonging to the phone you should connect it to your laptop, then also copy the two files above to the handset’s internal memory card. Now let go of the S3 SPH-L710 from the comp.
  2. The smartphone needs to be switched off. Select and press the keys labelled Power, Volume Up and Home at the same time. Then let go of them for a bit and afterwards press on all 3 of them once more. All of these actions combined will get you booted into ClockworkMod Recovery Mode.
  3. Opt for Backup and Restore; choose Backup. The phone will have received a NANDroid backup. Now return to the phone’s recovery menu and opt for Factory Reset/Wipe Data. Choose Yes and the handset will have its data wiped.
  4. For step four you have to return to the ClockworkMod Recovery main menu, choose Wipe Cache Partition and opt for Wipe Dalvik Cache. After that is done, choose installation of the file from the memory card.
  5. Select Choose zip from SD card and then find the custom ROM archive.
  6. Press Power to opt for it and then select Yes – Install .zip so that you can initiate the firmware installation. Do again what we wrote in the fourth (only the part with “choose Install zip from SD card”) and fifth steps; however, this time around opt for the gapps-jb-20121212-signed.zip archive. This will install the Google Apps pack. Next: return to the main recovery menu.
  7. Opt for the system restarting. Then go back to the stock ROM like this: boot into recovery, choose Backup&Restore and then look for the ROM in a list that will appear; when you find it, restore it on your Galaxy S3 SPH-L710.

If the update doesn’t work

Should you run into various issues, follow these steps.

  1. Perform Wipe Cache Partition.
  2. Perform Wipe Dalvik Cache.
  3. Reboot the phone.
Posted In How To - By Cristescu Adrian

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