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How to install Android 5.1.1 on the Samsung Galaxy S4 LTE-A GT-I9506
This article explains how you can install Android 5.1.1 on the Samsung Galaxy S4 LTE-A GT-I9506.
The procedure is likely the same as for the GT-I9505 and the GT-I9500, but I have not tested these and cannot be sure. The GT-I9506 is the most interesting one and has the best performance/price ratio as a used phone.
Warning: This phone is not the same as the normal S4 or any other phone from the large Samsung Galaxy S4 family, particularly not the GT-I9500, GT-I9502, GT-I9505, GT-I9507 or any S4 mini, and the instructions in this article will not only not work on those phones or on any other, but are likely to damage or brick them.
To use the download mode on the Samsung Galaxy phones to flash a custom ROM like CyanogenMod, you need either the sleek and reliable Heimdall tool or the tool Odin that originally came from Samsung.
Unfortunately the current Heimdall version 1.4.0 does not work with this phone. There is a newer 1.4.1 available, but I could locate only the Linux binaries. I could not find any windows binaries of this new version, so I had to revert to Odin, which turned out to work well enough.
As a conservative modder I preferred the official CyanogenMod version of Android over the various other mods. For the entire procedure you need the following files:
Download the files you need. You can either download them with a computer, then copy them to a suitable folder on your phone (like /U/flash), or you can download them directly with your phone, where they end up in the Downloads folder on your phone. If you like, you can move them from Downloads to another folder (like /U/flash on the SD memory card, if you have one) to keep your phone tidy, but you don't have to.
Windows Samsung driver problems
In most cases the drivers are installed automatically. But if you have driver problems, download Samsung USB Drivers – ANDROID MTK – Select your phone model, download and install the drivers by running the EXE file on your Windows computer.
Start the Samsung USB Drivers EXE file and check whether the drivers are installed without any error or failure message.
Boot the phone into download mode
It is preferable not to have the phone connected to the computer at this time, because the computer may get confused about which driver to install during the following phone boot process.
Power down the phone if you can. If not, just proceed anyway. Press and hold the three buttons volume down, the home key at bottom center, and the power button on the right side, at the same time. Keep pressing all three until the name of the phone appears in big white letters on the black screen (about 10 s), wait one more second, then release all three buttons.
You should see a warning screen that prompts you to press volume-up to start download mode. Do that.
Flash the TWRP recovery
The TWRP recovery you just installed should now appear on the screen. If it doesn't, you probably have not pressed the proper keys and thus booted into Android, which means that your freshly installed recovery got overwritten. You have to start again and use Odin to install TWRP.
While you have TWRP on the screen and running, these steps will install CyanogenMod on your phone.
If Android/CyanogenMod boots up and works, you have done it. Congratulations.
You can now use CyanogenMod's own update mechanism to update to future nightly or stable versions. The update process is started manually, but is then performed fully automatically, so you do not have to go through the above process again.
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