For those of you with AT&T Galaxy S4 SGH-i337 or Sprint Galaxy S4 SPH-L720, we have some good news for you there are stock firmwares now available so you can fully unvoid and unroot your device. There should be more coming for all the other variants such as T-Mobile and Verizon so stay tuned folks. Also, stock firmwares are already available for GT-i9500 and GT-i9505 users at SamFirmware.com.
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!