How to Install Android 16 on Samsung Galaxy S21 FE 5G [Download Link]

If you’re using a Samsung Galaxy S21 FE 5G and want to breathe new life into your device, installing an Android 16-based custom ROM is a solid move. Google...

Mohammed Huwais

Last updated on June 25, 2026

Mohammed Huwais

Author

I started my career as a blogger in 2014 and also worked on an Android niche platform to gain extra income. I cover the topic on How to guides, software updates, Custom ROM updates and also product review. I'm 24 years old, completed MBA (Master of Business Administration) from Sikkim Manipal University.

Samsung Galaxy S21 FE 5G Overview:

The newly launched Samsung Galaxy S21 FE 5G features a 6.4-inch AMOLED panel with a high refresh rate of 120 Hz. It is an FHD+ panel with a resolution of 1080 x 2400 pixels and an aspect ratio of 20:9. Under the hood, we have the Qualcomm Snapdragon 888 5G built on a 5nm manufacturing process. It is an octa-core processor with one Kryo 680 core clocked at 2.84 GHz, three Kryo 680 cores clocked at 2.42 GHz, and four Kryo 680 cores clocked at 1.8 GHz. Additionally, instead of the Snapdragon chipset in some specific regions, we have Exynos 2100 built on a 5 nm manufacturing process. It is an octa-core processor with one Cortex-X1 core clocked at 2.9 GHz, three Cortex-A78 cores at 2.8 GHz, and four Cortex-A55 cores clocked at 2.22 GHz.

Coming to the optics, we get a triple camera setup at the rear and a single camera at the front. The triple camera setup consists of a 12 MP primary sensor with an f/1.8 lens, an 8 MP telephoto sensor with an f/2.4 lens, and a 12 MP ultrawide sensor with an f/2.2 lens. At the front, we get a 32MP sensor with an f/2.2 lens. Both the front and rear camera setups can capture 4K videos.

Three storage variants are available for this smartphone: 128GB + 6GB RAM, 128GB + 8GB RAM, and 256GB + 8 GB. Regarding communications, we get Wi-Fi 802.11 a/b/g/n/ac/6, Bluetooth 5.0, GPS, NFC and USB Type-C. And for sensors, we have an under-display optical fingerprint sensor, accelerometer, gyro, proximity, and compass. Powering it all is a 4500 mAh battery that can be topped up quickly using the 25W adapter included in the box. The company claims the battery goes from 0 to 50% in 30 minutes. This smartphone is available in four color options: White, Graphite, Lavender, and Olive.

Android 16 Features:

Android 16 introduces Material 3 Expressive, a refined evolution of Google’s design language for smartphones and tablets. While it doesn’t completely reinvent the interface, it represents one of the most noticeable user-facing changes in the OS. Rather than a dramatic visual overhaul, Material 3 Expressive enhances the foundation laid by Material Design 3 by introducing smoother, more dynamic animations, larger touch targets, and bolder typography.

This update arrives at a perfect moment. Material Design 3, first introduced with Android 13, had begun to feel dated. Material 3 Expressive breathes new life into the interface while preserving the familiar look and feel users have grown comfortable with. Instead of overhyping the changes, Google’s own animations showcase the polish and fluidity of this next step in Android design.

Android 16 introduces a wealth of new features, system optimizations, and UI refinements. Some of the highlights include:

Live Notifications: Track real-time activities like deliveries or ride status with persistent, interactive notifications.
Low-Light Camera Enhancements: Improved software-based night photography.
Pro-Grade Media Support: Includes advanced codecs and battery-efficient audio processing.
Desktop Mode for External Displays: Better support for multi-window UI on monitors and tablets.
Accessibility Upgrades: Features like outlined text and improved input customization.
Performance Boost: Enhanced power management and reduced background CPU usage.

These updates aim to improve user experience across different types of devices, including foldables, tablets, and standard phones.

Although Android 16 is rolling out first to Pixel devices, many brands like Xiaomi, OnePlus, Samsung, Realme, and others will follow soon. If you’re impatient, a custom ROM is the best way to get Android 16 today.

What Works & Known Bugs:

What’s working?

Everything seems to be working fine.

Known issues?

If you spot any bugs, report them along with proper logs to the developer.

Before You Begin: Requirements:

1. Backup Your Data:

Always back up your device before flashing any ROM. This prevents data loss if anything goes wrong. Backup guide here.

2. Battery Level:

Charge your phone to at least 50% to avoid shutdowns during the flashing process.

3. Download ADB and Fastboot Binaries:

You can skip this part if you have already installed TWRP Recovery on your Galaxy S21 FE 5G. For those who haven’t, ADB and Fastboot commands (platform-tools) are required to boot your device into bootloader mode, allowing you to perform the necessary flashing operations. ADB (Android Debug Bridge) establishes a connection between your device and computer, while Fastboot is a more advanced command-line utility for flashing and modifying Android devices.

You can download the ADB and Fastboot Binaries (Platform-Tools) here.

4. Download USB Drivers:

You’ll need the appropriate USB drivers to ensure a successful connection between your Galaxy S21 FE 5G and your computer. These drivers enable file transfers, flashing, and other operations between your devices.

You can download the latest Samsung USB drivers here.

5. Unlock the Bootloader:

Unlocking the bootloader of your Galaxy S21 FE 5G. is essential before you can install any custom ROM. Make sure to follow Samsung’s official instructions for unlocking the bootloader. Unlocking the bootloader will wipe your device, so back up your data beforehand.

6. Install TWRP Recovery:

You must install TWRP Recovery on your phone to install any custom ROM on your device. After unlocking the bootloader, follow our guide to install TWRP Recovery on your Galaxy S21 FE 5G.

7. Download Android 16 ROM:

You can download the Android 16 custom ROMs for the Samsung Galaxy S21 FE 5G from the links below:

OS	Download Link
Lineage OS 23	Download
AstroROM	Download

8. Download Android 16 GApps:

Most AOSP ROMs don’t come with Google apps. You’ll need to flash Android 16 GApps separately.

Download Android 16 GApps

Note: Flash GApps right after flashing the ROM. Don’t reboot in between.

Warning!

GetDroidTips is not responsible for any issues that may happen to your device if you flash it on another device and brick it. Do it at your own risk.

Installation Guide: Step-by-Step

Connect your device to the PC via a USB cable. Make sure USB Debugging is enabled.
Then, go to the platform-tools folder, type CMD in the address bar, and hit Enter. This will launch the Command Prompt.
Execute the below command in the CMD window or enter recovery mode using the Volume and Power button combination to boot your device to TWRP Recovery:
```
adb reboot recovery
```
Now head to the Install section and navigate to the downloaded vendor and firmware. Perform a right swipe to flash it.
If you want Google Apps as well, you need to flash it at this instance. Go to Install, select the GApps ZIP file, and perform a right swipe to flash this file.
When that is done, you may reboot your device. Head over to Reboot and select System.

The first boot after installing a custom ROM may take a bit longer than usual, so don’t panic if it seems slow. After the device boots, you will need to set it up as a new device, just like when you first got it.

Final Words

By flashing Android 16 on your Galaxy S21 FE 5G, you’re extending its life and unlocking modern Android features that Samsung may never officially provide. While this is an unofficial AOSP build, early reports suggest solid stability. That said, bugs may still appear, so always report them with logs to help developers improve the experience.

If you have questions or run into issues during installation, feel free to drop a comment. Enjoy your fresh Android 16 experience!