If you want to install custom software, the easiest way to do it is through a custom recovery image.
All Android devices ship with what is called a stock recovery environment. This only allows for the installation of signed zip files which restricts you from being able to upload custom software.
Third-party developers have created another custom recovery, known as a custom recovery, that enabled the installation of these custom files, otherwise known as unsigned zip files.
A custom recovery image allows for partitioned backups, restores, factory settings, the flashing of signed zips, the chance to reboot the system, wipe the system, wipe the caches, and everything you could possibly think of that might coincide with what you’re trying to do. It is a recovery of sorts without limitations.
Details of Note
- The custom recovery images available in this guide are only to be installed on the Samsung Galaxy Express 2 smartphone. Most devices have a custom recovery image developed specifically for it, and you shouldn’t install one that is intended for another device unless advised it is okay by a professional.
- The codename for the Samsung Galaxy Express 2 TWRP Recovery image is “wilcoxltexx.” You will see that codename in the TWRP image file path and also from your About Device menu so you know you are flashing the right file on the right device.
- You can install the official TWRP Recovery application from the Google Play Store or from the TWRP website as an apk, if you have root access on the device already, and get the TWRP installed that way, no adb required. Once the app is installed, it will be in your Downloads folder. Navigate to the Downloads folder and select the TWRP application. When the application opens tap on the option for flashing the TWRP.
- Download on your computer the latest version of TWRP Recovery: Primary (Americas) | Primary (Europe).
How to Install TWRP Recovery on Samsung Galaxy Express 2
Note: The Odin flashing tool is really easy to use, but it only works on the Windows operating system. You won’t get the flashing tool to load on a Mac or Linux computer. It doesn’t really matter what version of the Windows operating system that you’re using as long as it is something above Windows XP.
1. Download and install the Samsung USB drivers on the computer if you don’t have them already.
2. Download the firmware (.tar) file from the links above directly to the computer. Extract the file by right-clicking on it and choosing the option to extract. When you do, you’ll see the tar.md5 file inside. That’s the file you’ll be using to do the flashing.
3. Download the Odin flashing tool. It doesn’t really matter what version, but the latest is the most up to date so grab that one. Extract the Odin file and then double-click on the Odin executable file (.exe) that is found from within the Odin folder after extraction. You should now have the Odin interface open on the computer and waiting for you to connect to it.
4. Boot the Samsung mobile device into the Download Mode by first powering it down and then rebooting by holding the Volume Down + Home + Power keys at the same time.
5. A yellow warning triangle will come up on the device’s display. At this time you need to press the Volume Up button. You’ll then see the device getting into the Download Mode. It’s then ready for the flashing.
6. When in Download Mode, connect the Samsung mobile device to the computer with the USB cable.
7. If you have installed the USB drivers correctly, the Odin flashing tool should detect your device. You can tell this by observing the ID: COM port lighting up with a color, usually yellow or blue.
It doesn’t matter what color, it’s the lighting up that counts.
8. After the device is picked up by Odin, click on the PDA or AP button, depending on what button your version of the Odin flashing tool has.
9. Navigate to the stock ROM folder and upload the tar.md5 file to this location in Odin.
10. Without changing any of the default settings, click on the Start button in Odin, and the flashing then begins.
11. Wait until Odin shows a Pass message before disconnecting your device.
You can now close the Odin flashing tool and continue using your computer if you like.
TWRP App Installation Method (Root Required)
If you decided to download the TWRP application from the Google Play Store or the APK file from the official TWRP website, then after you open the application you will be given a few different options to choose from. But before even going that far, it’s important to note that you should only install the TWRP APK file from the official TWRP website. If you’re installing it from Git, or any other file hosting website, it might not be the official version, and thus, it won’t have been built or tested by the official TWRP developers and maintainers.
Once the application is open, you’ll need to agree to not hold anyone from TWRP responsible for any issues that your device may face while using the application. This is a standard disclaimer that Team Win puts on top of each of the recovery image files from the official website as well, so it’s nothing new. It just explains that it is your decision to put the custom recovery on your device, and while they work hard to provide a quality product, there are no guarantees that your device isn’t susceptible to damages relating to TWRP while the custom recovery is installed. You can grant the application root permissions now as well. Root access can be obtained by flashing SuperSU, or other appropriate rooting files, from the custom recovery itself. Without root, you won’t have access to some of the app’s features, such as image flashing. It’s here also where you can enable InsightCore (a feature to monitor and record the network performance of your device).
Once you’ve accepted the agreements, you’ll see the TWRP application’s home screen, where you can choose to flash TWRP or view the network statistics. When choosing to flash the custom recovery, you’ll need to scroll and select your device from the list to make sure you are flashing the correct file. When the device is chosen, the TWRP application automatically then searches for the latest version of the TWRP for that device and will continue doing so every day for as long as the app is installed. This interval can also be altered from the Settings in the top right-hand corner of the device’s display when the apps open.
If root access has been enabled, you’ll see the chance to select the custom recovery image and the buttons for flashing the images to boot or from recovery. You should choose to flash the images to recovery. Only use the boot image flashing when you are flashing full boot images, not just kernel zimages.
DD Installation Method
You can also get the custom recovery installed on the Samsung Galaxy J7 Exynos SM-J700 smartphone by using the DD install method. To do it this way, download the latest recovery image file for your device from its downloads page on the official TWRP website (Primary [Americas] | Primary [Europe]) and then place the file in the root of your /sdcard folder. Rename the image “twrp.img.”
You then need to run the following commands from the ADB shell or a Terminal Emulator application:
dd if=/sdcard/twrp.img of=/dev/block/bootdevice/by-name/recovery
Custom recovery images do not support official software updates. A stock update never modifies the system partition, which is different to an update that happens when installing custom software or some root applications. Once you have made changes to the system partition, you could experience instability when going back to stock software.
With this knowledge, there’s certainly no need to be attempting to flash stock software updates from a custom recovery, even if it did have the ability to flash them. Root access is a different story though. If you did have root access by flashing a file such as SuperSU from the custom recovery image, then you could open the SuperSU application, choose to unroot the device from the Settings and then you would be unrooted. This has not made any changes to the custom recovery, and you would still find it there by booting the device into the recovery mode.
Once you’ve installed a custom recovery, you won’t even notice it there’s, so there’s no real pressure to get rid of it in the future. But if you did want it gone, you could flash the stock recovery image file the same way you flashed the custom recovery image. The stock recovery images are usually found in the Samsung stock ROM zip files. Just find the firmware for your device, unzip the archive and then you’ll see the recovery image to flash. Or, if you prefer, you could just use a flash tool to flash the complete stock ROM, and that too would fix the problem. When you flash the stock ROM package that has the recovery image inside, it will automatically override the custom recovery image with the stock recovery image.
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