How to Install BlissRoms on OnePlus 9 Pro [Video]

Sadique Hassan•Updated Dec 29, 2023

In this guide, we will show you the steps to install the latest BlissROMs on your OnePlus 9 Pro. For many, the ninth iteration of devices from this OEM was the last in this lineup that truly had the USP of OEM because, after that, it all went downhill. The 9 series users had both the luxury to truly enjoy the original OxygenOS as well a working MSM Download Tool that would allow them to easily unbrick their device as and when required.

And it’s due to its MSM Tool only that the device has gathered quite a lot of support from the development community, especially when it comes to custom ROMs. Talking about which, the users are literally spoilt for choices, with a plethora of options to choose from. So which one should you opt for?

Well, if you are looking for a fast stable optimized OS with just the right amount of customizations and features [and not to mention the oxygenOS camera], then installing BlissROMs onto your OnePlus 9 Pro might be your best bet. So without further ado, let’s make you aware of its installation steps.

Table of Contents

How to Install BlissRoms Android 14 on OnePlus 9 Pro

Before starting with the process, make sure to take a complete device backup beforehand. 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.

STEP 1: Install Android SDK

First and foremost, you will have to install the Android SDK Platform Tools on your PC. This is the official ADB and Fastboot binary provided by Google and is the only recommended one. So download it and then extract it to any convenient location on your PC. Doing so will give you the platform-tools folder, which will be used throughout this guide.

STEP 2: Enable USB Debugging and OEM Unlocking

Next up, you will have to enable USB Debugging and OEM Unlocking on your device. The former will make your device recognizable by the PC in ADB mode. This will then allow you to boot your device to Fastboot Mode. On the other hand, OEM Unlocking is required to carry out the bootloader unlocking process.

So head over to Settings > About Phone > Tap on Build Number 7 times > Go back to Settings > System > Advanced > Developer Options > Enable USB Debugging and OEM Unlocking.

STEP 3: Unlock Bootloader

Next up, you will also have to unlock the device’s bootloader. Do keep in mind that doing so will wipe off all the data from your device and could nullify its warranty as well. So if that’s all well and good, then please refer to our detailed guide on How to Unlock Bootloader on OnePlus 9, 9 Pro and 9R

STEP 4: Download BlissRoms, Recovery, GApps for OnePlus 9/9 Pro

Now, get hold of the BlissRoms, Recovery, and associated files from below:

OnePlus 9 Pro [lemonadep]: BlissROMs | Recovery | vendor_boot | dtbo | vbmeta | super_empty.img

Rename the Custom ROM to rom.zip and transfer it to the platform-tools folder.

STEP 5: Boot to Fastboot Mode

Connect your device to the PC via a USB cable. Make sure USB Debugging is enabled.
Then head over to the platform-tools folder, type in CMD in the address bar, and hit Enter. This will launch the Command Prompt.
After that, type in the following command in the CMD window to boot your device to Fastboot Mode
```
adb reboot bootloader
```
To verify the Fastboot connection, type in the below command and you should get back the device ID.
```
fastboot devices
```

STEP 6: Flash vendor_boot and dtbo

First off, wipe the super partition via the super_empty.img file:
```
fastboot wipe-super super_empty.img
```
Next up, execute the below command to flash dtbo:
```
fastboot flash dtbo dtbo.img
```
Then type in the below command to flash the vendor_boot:
```
fastboot flash vendor_boot vendor_boot.img
```
After that, use the below command to flash the vbmeta:
```
fastboot flash vbmeta vbmeta.img
```

STEP 7: Flash BlissROMs Recovery on OnePlus 9/9 Pro

You will now have to flash the BlissROMs recovery onto your device. So execute the below command for the same:
```
fastboot flash boot boot.img
```
Once the flashing is complete, type in the below command to boot to BlissROMs Recovery.
```
fastboot reboot recovery
```

STEP 8: Factory Reset Device

From the BlissROMs Recovery, go to Factory Reset.
Then select Format Data/Factory Reset > Format Data.
Your device will now undergo a reset.
Once done, you shall get the “Data wipe complete” message

STEP 9: Install BlissROMs on OnePlus 9/9 Pro

From the BlissROMs Recovery, go to Apply Update > Apply from ADB.
Then head over to the platform-tools folder, type in CMD in the address bar, and hit Enter.
This will launch the Command Prompt. So type in the below command to flash the ROM file via Sideload:
```
adb sideload rom.zip
```
The process will now begin and once done, you shall get the Total xfer: 1.00x message [Got an error? See FAQ below].
[Optional] If you want to install any additional mods [like Magisk], then go to Advanced > Reboot to Recovery. Now sideload the desired file.
Finally, you may now boot your device to the newly flashed OS via Reboot System Now.

That’s it. These were the steps to install the BlissROMs based on Android 13 onto your OnePlus 9/9 Pro. If you have any queries concerning the aforementioned steps, do let us know your doubt and the device that you are using in the comments. We will get back to you with a solution at the earliest.