Faced with a black screen and a chilling message of "failed to mount cache invalid argument" on a Xiaomi smartphone, many users are stupored.This error means that the cache system partition is corrupted or formatted in a file system that the current recavator can't read, most often after a failed update, an interrupted firmware process, or an attempt to install a custom TWRP recavator.
Don’t panic, as in most cases your personal data (photos, contacts) remain safe in /data. However, you can’t ignore this situation, since the phone is in a “brick” state and can’t boot the Android operating system.
There are several proven solutions, ranging from simple reset via the standard menu to low-level partitioning through fastboot. The choice of method depends on whether you have the bootloader unlocked and which version of MIUI or HyperOS was installed before the crash.
Causes of failure of cache mounting
Understanding the root of the problem is half the success. The invalid argument error often indicates a conflict of file system versions. For example, if you upgraded from Android 11 to Android 13, the partition structure may have changed, and the old recovery simply does not know how to work with the new markup options.
Another common cause is partition table damage, which could be caused by a sudden battery drain during data writing or mechanical memory damage, and an incompatible version of TWRP that was installed on top of the original bootloader may also be the culprit.
Sometimes the problem lies in an incorrectly assembled firmware zip file that the user tried to install manually, and if the archive did not have update scripts or they contained errors, the mounting process was interrupted, leaving the partition in a broken state.
Resetting method via Fastboot and ADB
If the phone goes into Fastboot mode, you have the option of using the computer to force partition cleaners.This method requires the installed Xiaomi USB Driver driver and ADB utility.
Connect your smartphone to your PC through the original USB-Open the command line in the platform tool folder and enter the command to check the connection: fastboot devices. If the device is determined, you can proceed to clear the problem partition.
You need to format the cache section. Type the command:
fastboot erase cachefastboot reboot
userdata
☑️ Pre-reset check
Use of custom TWRP recavator
For owners of devices with unlocked bootloader (Unlocked Bootloader), the most effective solution is to use a custom TWRP recavator. It has more flexible file system management tools compared to the stock menu.
Once you enter the TWRP menu, go to the Wipe section and select Advanced Wipe. Check the Cache, Dalvik/ART Cache and Data sections if necessary. It is important not to confuse or delete system files unnecessarily.
Once you select the partitions, slide the slider to start cleaning. If standard formatting doesn't help, TWRP lets you change the file system. Select the Cache partition, press Repair or Change File System, and try formatting it to EXT4 or F2FS.
⚠️ Warning: Changing the file system of a Data or Cache partition can result in complete data loss and the inability to load stock firmware without completely reflashing.
Comparison of recovery methods
The choice of method depends on your technical training and the condition of the device. Below is a table that helps to determine the tactics of actions depending on the available tools and the status of the bootloader.
| Method | Status required | Risk of data loss | Difficulty |
|---|---|---|---|
| Wipe Data (Recovery) | Anybody. | High (100%) | Low. |
| Fastboot Erase | Unlocked BL | Medium. | Medium |
| TWRP Format | Unlocked BL | Depends on the action. | Tall. |
| Mi Flash Tool | Unlocked BL | Tall (Clean All) | Medium |
Complete flashing through the Mi Flash Tool
If the soft methods did not help, then the “heavy artillery” remains – a complete flashing of the device through the official utility Mi Flash Tool, which is guaranteed to eliminate the failed to mount cache error, as it recreates the structure of all partitions.
You will need to download the Fastboot ROM image for your particular model from miui.com. The archive must be unpacked to the root of the disk so that the path does not contain Cyrillic, run the program on behalf of the administrator and connect the phone in Fastboot mode.
In the program interface, select the mode clean_all. This action will completely erase the internal memory, but create a new, correct file system. Press the Flash button and wait until the process is over, which may take a while. 5-10 minute.
⚠️ Attention: When choosing a regime clean_all_alllocks The bootloader is re-locked. Make sure you are flashing the region (Global, China, EEA), It is compatible with your device, otherwise hard-brick is possible.
What to do if Mi Flash is a Flash Error Error?
Prevention of File System Errors
To avoid a repeat of the situation, it is important to follow certain rules when modifying the system. Never interrupt the recording process. Even if the phone seems to be getting stuck, give it time to complete background operations before removing the battery (if it is not removable, wait for the discharge).
Always check the integrity of the firmware you downloaded. MD5-A hash file published on the developer forum, where even one bit does not match, can lead to critical installation errors.
Backups of important data to the cloud or to your computer regularly, mounting errors are just one type of failure, and having a copy of the data will save you from losing valuable information at the most inopportune time.
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Use the adb backup command before experimenting with firmware to save the list of applications and their data without the need for a full system backup.
When the help of a service center is required
There are situations where software methods are powerless. If the error returns immediately after flashing, or the phone is not detected at all by the computer (EDL mode without the possibility of logging into Fastboot), the problem can be hardware.
Flash memory wear is a natural process, and if memory cells are physically degraded, it becomes impossible to write new data, which causes an argument error when mounting, in which case only replacing the motherboard or memory chip will help.
It is also worth contacting specialists if the device is under warranty. Independent unlocking the bootloader or installing TWRP will void the warranty obligations of the manufacturer Xiaomi.
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If no software method has helped and the phone goes into a cyclic bootloop immediately after the Mi logo, there is a high probability of physical damage to the drive.