How to Install One UI 7 Android 15 on Galaxy S21 FE

In this guide, we will show you the steps to install numerous One UI 7 ports based on Android 15 onto your Galaxy S21 FE. So without any further ado, let’s get started.

How to Install One UI 7 on Galaxy S21 FE

Before starting, please take a backup of all the data on your device. Droidwin and its members wouldn’t be held responsible in case of a thermonuclear war, your alarm doesn’t wake you up, or if anything happens to your device, and data by performing the below steps.

Install FusionOS One UI 7 Android 15

SUPPORTED DEVICES: Galaxy S21 FE Qualcomm Snapdragon variant (G990B2)
PORTED FROM: Galaxy S21 FE (QCOM | R9Q)

1. Download and extract Android SDK Platform Tools on your PC.
2. Now enable USB Debugging and OEM Unlocking on your device.
3. Once that is done, unlock the bootloader on your device as well.
4. Now, boot your device to the FastbootD Mode via the command:

   adb reboot fastboot

5. Now download the One UI 7 ROM ZIP file from below:

   DOWNLOAD LINK [Credits: XDA Member leizafk1e3]

6. Then, extract the ZIP file using 7 ZIP [recommended].
7. Now, flash the files using the commands given below:

   fastboot flash system system.img
   fastboot flash product product.img
   fastboot flash vendor vendor.img

8. Then do a format data via the below command

   fastboot -w

9. Now boot your device to the stock recovery via

   fastboot reboot recovery

10. Now use the volume keys to highlight Format Data and press the Power key to confirm.
11. Once the formatting is done, you may now select Reboot System Now to boot to the OS.

Install EquinoX OS One UI 7 Android 15

SUPPORTED DEVICES: Galaxy S21 FE Qualcomm Snapdragon variant (G990B and B2)
PORTED FROM: Galaxy S24+ Beta 4 (OneUI7)

BUGS

• Camera
• FOD (Fingerprint-on-Display)
• Bluetooth
• HDR videos
• SELinux Permissive

FIXES

Since Bluetooth crashes literally every second and there’s currently no fix for it, it’s better to disable it via the following command:

• If you have root: su -c cmd bluetooth_manager disable
• If you don’t have root: adb shell cmd bluetooth_manager disable

Moreover, if you want to try this ROM for G990B, then you would have to flash the super.img as it is, then flash your stock vendor, then go to any root manager [such as Solid File Manager app], and delete the iccc from /vendor/lib/hw.

INSTALLATION STEPS

1. Download and extract Android SDK Platform Tools on your PC.
2. Now enable USB Debugging and OEM Unlocking on your device.
3. Once that is done, unlock the bootloader on your device as well.
4. Now, boot your device to the FastbootD Mode via the command:

   adb reboot fastboot

5. Now download the One UI 7 ROM ZIP file from below:

   DOWNLOAD LINK [Credits: XDA Senior Member Aniket6343]

6. Then, extract the ZIP file using 7 ZIP [recommended].

Install Monster ROM OS One UI 7 Android 15

SUPPORTED DEVICES: Galaxy S21 FE 5G with Exynos 2100 SoC (SM-G990E)
PORTED FROM: Galaxy S24+ Port One UI 7 Beta 4

1. Download and extract Android SDK Platform Tools on your PC.
2. Now enable USB Debugging and OEM Unlocking on your device.
3. Once that is done, unlock the bootloader on your device as well.
4. Then flash the TWRP Recovery on your device. Use the instructions given in the linked guide, just use these recovery.tar and vbmeta.tar files.
5. Now download the One UI 7 ROM ZIP file from below:

   DOWNLOAD LINK [Credits: XDA Member Luu Phuong]

6. Then extract it and transfer the super.img file to your device.
7. Next up, download the Proton Kernel and transfer it to your device as well.
8. Now boot the device to the TWRP Recovery via the below command:

   adb reboot recovery

9. Then go to Install > tap on Install Image > select super.img > select the Super partition > swipe to flash.

   Here's how to Fix Size of image is larger than Target Device

10. Once done, go to Install, select the Proton Kernel, and flash it.
11. Now go to Reboot > Recovery. Then go to Wipe and do a Format Data.
12. Then download multidisabler, transfer it to your device, and flash it.
13. Finally, go to Reboot and select System. Your device will boot to One UI 7.

That’s it. These were the steps to flash One UI 7 Android 15 ports onto your Galaxy S21 FE. If you have any queries concerning the aforementioned steps, do let us know in the comments. We will get back to you with a solution as soon as possible. Likewise, we will be constantly updating this post with more ports as and when they are live. Stay tuned!

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