How to Install Custom ROM on Samsung Galaxy Tab S4 [GSI build]

Flashing the ROM in Samsung Galaxy Tab S4 is easy! All you need to do is follow the instructions carefully. If you are a newbie, then you need to understand that before flashing, you must unlock the bootloader on your Samsung Galaxy Tab S4. To unlock the bootloader, follow our guide on how to unlock the bootloader on any Samsung device.

If you already unlocked the bootloader, then you can simply follow our guide to install the custom ROM on Samsung Galaxy Tab S4. Before that, let’s understand What is a GSI build.

What is GSI Stands for?

GSI stands for Generic system image which is an Android System image that can be used to replace the current installed Android version with a new one. It is a pure Android with an unmodified Android Open Source Project (AOSP) code. With Android 8.1, Google introduced the project treble support for many devices and now with Android 9.0 Pie, Google finally added the API level 28 to support Generic System Images to all app developers to install and run the latest Android GSIs on a variety of existing Android devices. To know more: Read here

How to Install Custom ROM on Samsung Galaxy Tab S4

To install, as we said, you need to unlock the bootloader and must have a TWRP (to install via a device) or a PC (to install via Fastboot). Yes, there are two methods to install the custom ROM GSI on Samsung Galaxy Tab S4.

Disclaimer

AOSP GSIs which is still marked as a pre-release. Even on a device that runs Pie GSIs nicely, it’s still possible to get broken media, camera, RIL, or even flat-out no-boot. You are strongly advised to try PHH’s original and then identify/report issues there, before moving onto other GSIs that is based on his work. Please report bugs on the same thread related to the ROM.

We’re at GetDroidTips won’t be responsible for any kind of damage or error that occurs to your handset while or after following this guide. This is a Custom ROM and may contain some of the bugs or stability issues. We can’t recommend you to use this firmware as your daily driver. Proceed at your own risk.

Pre-Requirements:

This guide is for the Samsung Galaxy Tab S4.
You will require to unlock the device bootloader at first
ARM, ARM64, or x86: Check your Android Phone’s Processor
Treble Support: Check If Your Smartphone Supports Project Treble
Download the required file and Support the GApps file from below.
Keep your device battery charged up to 60% at least for a smoother process.
Take a complete backup of your device data without Root. In case anything goes wrong, you can easily restore all the data.
Download and install Samsung USB Drivers
For adb method: Download ADB and Fastboot tool
For TWRP Method: Download and Install TWRP Recovery on Samsung Galaxy Tab S4

Note:

A only arm32 – arm avN
A only arm64 – arm64 avN
A/B arm64 – arm64 bvN
A/B arm32 – arm bvN

Download Links:

Download AOSP Android 12 GSI
AOSP 11.0 Quack Phh-Treble: Download
HAVOC OS 4.1 GSI: Download
LineageOS 18.1 Download – If broken link, check official forum

Install via TWRP Recovery:

This guide is for those users who have installed TWRP recovery on your device. If your device is not supported, you can try the next method to install the custom ROM via GSI build.

To install via TWRP, you need to factory reset your device using TWRP
Go into the Wipe option and Swipe to Factory Reset.
Transfer the GSI build to your Samsung Galaxy Tab S4 using a USB Cable.
Once you have moved, you can remove your USB cable.
In your TWRP, tap on the install button –> Change type to Install Image and find the GSI you have moved in the 3rd step.
Confirm the flash by choosing the system partition
Once it is done, you can reboot your device and wait for a few minutes to boot up.

Flash via Fastboot

First, do the factory reset on the Samsung Galaxy Tab S4. There are two methods to do it, follow anyone.
- Factory Reset When Powered On: To install without TWRP, you have to factory reset using your Umdigi A7 Pro factory reset option.
- Factory Reset via Stock Recovery: Reboot your Samsung Galaxy Tab S4 into stock recovery using a button combination or ADB command.
```
adb reboot recovery
```
- In your Stock Recovery, navigate using the Volume UP and DOWN button.
Make sure to extract the downloaded GSI build.
After resetting the factory ROM, you can now boot your device into bootloader mode using the adb command adb reboot bootloader.
Now open the extracted folder of GSI build, there, now open the command prompt window by holding the SHIFT KEY and Right Mouse click.
In your command window, enter the command fastboot erase system
To flash the system image, enter a command in the following format: fastboot -u flash system name_of_system.img
Wait for the image to flash, it could take a few minutes. Once it has been completed, reboot your device either manually via power key or by entering fastboot reboot and wait for a few minutes to boot up.

We hope that this guide is helpful to you and you have successfully installed the Custom ROM on your Samsung Galaxy Tab S4 handset easily. If in case anything goes wrong or if you have any queries, feel free to ask in the comments below.

Credits to all the developers from the XDA forum and 4PDA forum