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There’s some great news for AT&T or Verizon Galaxy S4 users, bootloader is not unlocked BUT we have LOKI method by XDA user DJrbliss that allows developers to bypass bootloader check to enable custom recoveries and custom ROMs.
So, now you can install CWM recovery for AT&T or Verizon Galaxy S4.
NOTE: This method does NOT WORK on users on latest AT&T Galaxy S4 with MF3 firmware until we find a new method for it, sorry!
Step 1. Download the two files onto your phone.
Use ES File explorer and browse to your Download folder, rename loki_flash.bin to loki_flash.
Step 2. Copy both loki_flash and recovery_lok.
Step 3. Paste the two files into /data/local/tmp directory. (You might have to enable Root in ES File Explorer!)
Step 4. Download and open Android Terminal Emulator app from Play Store.
Step 5. Type:
Make sure you hit “Allow” or “Grant” if Superuser permission window pops up.
chmod 755 *
./lok_flash recovery recovery.lok
If you get successfull message, you can type the following to reboot into recovery:
Step 6. You should now be in CWM recovery. Try rebooting and make sure you hit “Yes” if it asks you for root fix or recovery fix. That’s it! Now, you can backup/restore ROMs and install custom ROMs!
Credits – Djrbliss! <— Please donate to the developer of LOKI!
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!