And while each of these partitions are important in their own rights, it is the system partition that could be categorized as the most important one. The reason is pretty simple: it holds your OS. However, if there’s an issue with this partition, there are bound to be issues. Among the various issues, the most common is associated with TWRP. Many concerned users have complained that they are unable to mount the system partition on their device. As a result, every time they are about to flash a Custom ROM, TWRP displays the failed to mount /system (invalid argument) error message. While this issue is justifiably concerning, fortunately, it could be fixed via a few workarounds. So without further ado, let’s check them out.

How to Fix failed to mount /system (invalid argument) in TWRP

Before trying out any of the below-mentioned fixes, it is highly recommended to 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.

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Fix 1: Install Stock Firmware via TWRP

In this method, we will be wiping all the device partitions and then flashing the stock OS via TWRP. While most devices come with a Recovery ROM (including OnePlus’s OxygenOS and Xiaomi’s MIUI Recovery ROM), there are some that don’t have a custom recovery-supported flashable ROM. For those set of devices, they should refer to our guide to Flash Stock Firmware via Fastboot Commands. Whereas for other users who could flash stock ROM via TWRP, they should proceed with the below instructions:

Fix 2: Repair System Partition via TWRP

You could also use the TWRP’s built-in Repair File System feature to repair the system partition on your device. Here’s how:

Fix 3: Refresh EXT4 File System via TWRP

By default, your device would be having the EXT4 File System. In this section, we would change it to EXT2 and then revert to the original EXT4. Here’s how it could be done:

So with this, we conclude the guide on how to fix the failed to mount /system (invalid argument) error in TWRP. 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. If you cannot select the System Partition via TWRP, then you would have to wipe it via Fastboot Commands. Here’s how it could be done:

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