After rooting an Android phone, you can switch the operating system ROM whenever you want. The rooting process removes the preinstalled operating system on the Android phone, replacing it with a rooted Android OS. The rooting removes any limitations and restrictions implemented in the operating system by the hardware provider, such as your wireless carrier. The ROM Manager application, available for rooted phones, facilitates changing ROMs with a custom recovery application called ClockworkMod Recovery. ClockworkMod handles all of the ROM loading so you don’t need to use terminal commands to flash the ROM onto your system.
Step 1 Open ROM Manager from your phone’s Applications menu. Tap “Flash ClockworkMod Recovery” and select your phone model. Tap “OK” once it completes this process. If you have already added ClockworkMod through ROM Manager, you do not need to do so again.
Step 2 Tap “Install ROM from SD Card.”
Step 3 Tap the ROM file you’re flashing to your phone. ROM Manager only displays the ROM files located on the base directory of the SD card, so all of your ROM files need to be saved in this location.
Step 4 Tap “Backup Existing ROM” and “Wipe Data and Cache.” Tap “OK.” Tap “OK” to reboot the smartphone into ClockworkMod Recovery. You do not need to provide any additional input during the ROM installation process after it reboots, as ClockworkMod handles the rest of the installation.