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After rooting your Galaxy S4 with CWM method, I highly suggest you to make a backup ROM before you start installing a custom ROM or anything else.
What is a backup ROM?
Backing up your ROM will back up your whole system including your apps, app settings, and everything except your personal media such as photos and videos. Having a backup ROM makes it easy to recover your phone when something goes wrong such as bootloops.
So, if you did root your Galaxy S4 using CWM method, here’s how to backup and restore ROM on your Galaxy S4.
Step 1. Power off your phone and hold down Volume Up, Center Home, and Power button together for about 5 seconds.
Step 2. When you see Samsung logo, keep holding down Volume Up and Center Home buttons but let go of the Power button.
Step 3. You should be now in CWM (ClockworkMod) recovery. Choose “backup and restore” and hit the Power button.
Step 4. Choose “backup” to backup ROM on your internal storage or choose “backup to external sdcard” to backup ROM on your microSD card.
Step 5. Backing up will take around 5-10 minutes. And if you don’t get any error messages, you are good to go.
What is a Custom ROM?
A custom ROM is a custom, modified operating system that you can install on your Android device. Basically it's like installing Windows OS on a Macbook. By installing a custom ROM, you can bypass stock factory settings like locked hotspot tether, install new Android versions early, or even convert your phone into another OS.
With a custom ROM, you can really maximize the capabilities of your smartphone by adding custom features that have been developed by open source developers.
How to Install Custom ROMs
First, you will need to root your device, if it is not rooted yet, follow our root tutorial and root your phone.
Once rooted, you should have TWRP installed on your phone. Installation of a custom ROM is easy if you learn the basic of it. If you don't know how to install custom ROMs using TWRP recovery, see our tutorial on How to Install Custom ROM using TWRP!