How to Update AT&T Galaxy S4 GamerROM with Android 5.1 Lollipop XDA developers have launched a new custom ROM tilted as GamerROM. It’s based on AOSP Android 5.1 Lollipop version and the Samsung Galaxy S4 Verizon model users can flash it on their devices now. Presently, a latest version of GamerROM is out now and it can be used on AT&T Galaxy S4 devices. Hence if you would like to flash the update on your device, then follow the below steps carefully. GamerROM works on Android 5.1 Lollipop version. It doesn’t consist of any pre-installed applications and TouchWiz UI features which will enable the users to have user friendly experience with the server. It can be easily customizable on your AT&T Galaxy S4 as well. Pre-requisites: The following guidelines are made for the AT&T Galaxy S4 only. Make sure that your device has at least 80% battery backup while doing the following process. Enable a proper custom recovery tool like CWM or TWRP on your device. Install required USB drivers on your PC and USB Debugging Mode on your Smartphone. Steps to Install Android 5.1 Lollipop on AT&T Galaxy S4 with GamerROM: Step 1: You can begin with the downloading of update firmware files on your PC. Step 2: Make sure that you haven’t unzipped the file. Keep it on the PC. Step 3: Now, with the help of a USB cord, transfer the above downloaded files to your Smartphone. Step 4: Once you’re done with it, remove the USB cord then. Turn off the device and go to the recovery mode. Step 5: Go to the main menu and select these options: “wipe data factory reset”, “wipe cache partition” and “wipe dalvik cache”. Step 6: Then, choose “install zip from SD card” and “choose zip from SD card”. Step 7: Select the above downloaded files and install it on your AT&T Galaxy S4. Step 8: Wait until the files get flashed. You can move back to the recovery menu and select “reboot system now”. It’s done now. You can start using the GamerROM firmware on your Smartphone based on Android 5.1 Lollipop OS.