For those of you who tried to install regular CWM recovery for AT&T or Verizon S4 with locked bootloader, you may end up in a nasty bootloop.
To fix, you just simply need to flash stock recovery back with ODIN.
Download the tar file and flash with ODIN, your phone should be booting now.
Also, you can install stock recovery on any stock firmware that you’ve rooted with CWM or TWRP recovery so you can take OTA.
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!