How to Flash one Custom ROM over another [2 Methods] [Video]

In this guide, we will show you two different methods to flash one custom ROM over another on your OnePlus device. The devices from the Chinese OEM are among the most active players in custom development, well at least till the ninth iteration. They are blessed with tons of custom ROMs, each having its own set of USPs. While some [like the LineageOS] offer a clean stock usage experience without any GApps, others [such as the crDroid] offer tons of goodies.

Then we also have the likes of Pixel Experience which gives you a carbon copy of the stock Pixel UI. All in all, the users are ultimately spoiled for choices and are having to deal with the problem of plenty [not that we are complaining though!]. The best way of dealing with this “issue” is to simply give them all a try- however, that is easier said than done.

Not only is the process tedious but it could also prove to be complicated, especially when dealing with A/B partitions. Therefore, in this guide, we will show you two different methods through which you can easily flash one custom ROM over another, or in other words, go from one Custom ROM to another on your OnePlus device. So without further ado, let’s get started.

How to Flash One Custom ROM Over Another [2 Methods]

First and foremost, do keep in mind that you cannot save your data while moving from one custom ROM to another- a data wipe/factory reset is absolutely necessary. So please take a backup of all the data on your device before proceeding ahead. 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.

METHOD 1: Using Fastboot Commands

This is the shorter and easier of the two and is usually the recommended one. But you could only use this method if your device can at least boot to the Fastboot Mode. If it is currently in a bricked state, then this approach will not work, and you’ll have to try out the next method.

1. First off, flash the latest Fastboot ROM onto your device via Fastboot Script. This will take you to OxygenOS 11.
   
2. Do not connect to the Internet as of now. Instead, enable Developer Options, go there, and disable Automatic System Updates.
3. You may now turn on the internet. Then download and install the Oxygen Updater app.
4. Then launch it and download the latest OxygenOS firmware.
5. Now go to Settings > System Updates > Local Upgrade and select the downloaded firmware file.
6. The installation will now start. Once done, restart your device. It will reboot to the latest firmware.
7. Now flash the latest firmware across both slots via the Firmware Flasher Tool.
   
   
8. That’s it. You may now flash the desired custom ROM onto your device.

METHOD 2: Via MSM Download Tool

This is the lengthier of the two methods but does come with the added benefit that it will work under all scenarios- whether your device is soft-bricked, bootloop, or even hard-bricked. So with that in mind, let’s get started.

1. To begin with, flash the OxygenOS 11 firmware via the MSM Download Tool.
2. Since MSM relocks the bootloader, you’ll now have to unlock the bootloader.
3. Once done, download and install the Oxygen Updater app.
4. Then launch it and download the latest OxygenOS firmware.
5. Now go to Settings > System Updates > Local Upgrade and select the downloaded firmware file.
6. The installation will now start. Once done, restart your device. It will reboot to the latest firmware.
7. Once done, flash the firmware across both the slots. For that, use the Firmware Flasher Tool.
   
8. That’s it. You may now flash the desired custom ROM onto your device.

So these were the steps to flash one custom ROM over another or move from one ROM to another on your OnePlus device. 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 at the earliest.

• Enable 5G on OnePlus 7/8/9 series via QPST & carrier_policy.xml
• Install Custom ROM & Root OnePlus with Locked Bootloader!
• How to Install Android 14 Custom ROMs on OnePlus 8T [Videos]
• How to Uninstall Facebook/Meta Services from OnePlus Open

The post How to Flash one Custom ROM over another [2 Methods] [Video] appeared first on DroidWin.