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For those of you who want to unroot your Galaxy S4 and remove root completely so your phone is back to completely stock, it’s pretty easy to do with ODIN and stock firmware.
This is great to get your phone back to stock status for returning your Galaxy S4 for warranty or perhaps you’ve ended up in a bootloop and simply want to get back to stock ROM.
Now, before we begin, you should make a backup of EVERYTHING on your internal storage as you might have to do a factory reset in the end if you end up in a bootloop, which will erase everything on your phone. (If you have CWM or TWRP recovery installed, you can get around this by doing a data wipe/factory reset BEFORE you unroot.)
Also, Triangle Away app should support Galaxy S4 soon so you can reset your binary counter. Run Triangle Away app BEFORE starting unrooting process.
Step 1. Power off your Galaxy S4 and hold down Volume Down, Center Home, and Power button together for about 5 seconds.
Step 2. When you see the warning screen, hit Volume Up button to enter ODIN Download mode.
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!