Failed To Mount Data may be the most annoying error that your Android device may come up any moment when you are trying to play around. The reason for this error to pop up is something going wrong with the internal storage partition of your phone. This can happen when you are applying any tweaks or trying to modify your phone using something custom. Once this error comes up, it will not let your phone boot up and it will stay stuck in the boot-screen unless you fix it. 
Fixing this error is not as easy as it seems. Simply wiping the cache will not be good enough. You have to try multiple workarounds and see which one suits the situation. Simply factory resetting your device might fail as well. This error is more of bad news because while trying to fix it, you will lose all your data. If you have a backup previously, then you are on a safe side. Let’s have a look at the available solutions and see which one works out for fixing Failed To Mount Data (Invalid Argument) error.
How To Fix Failed To Mount Data (Invalid Argument)
Method #1 Wipe Data/Factory Reset
- Boot your Android phone into recovery mode. You may use the Volume Down + Home button for Google Nexus and other smartphones. Use Volume Up + Power + Home button for Samsung phones and for other phones use Volume Up + Volume Down + Home button.
- Once you are in recovery mode, use Volume Up and Down keys to navigate to “Wipe Cache Partition” option. Press Power Key to select it and then wipe it.
- Reboot the device and see if it boots up. This is just a try, it won’t boot up though.
- Now boot into recovery mode again and this time select “Wipe Data/Factory Reset”. This will wipe the partition from your phone.
- Now reboot and your phone should boot up fine.
Method #2 Wipe Data/Factory Reset using a Custom Recovery
For this method to work, you need to have a custom recovery like TWRP, CWM or Philz Advanced CWM installed on your phone.
- Install TWRP recovery or any other recovery depending on your convenience.
- Now boot into the recovery that you just installed.
- If you have TWRP recovery, then do this.
- Boot into TWRP and tap Wipe > Advanced Wipe > Select the Data partition, cache and Dalvik cache > Wipe > Swipe to confirm wipe.
- Reboot your device and it should just boot up right.
- If you have Philz Advanced CWM, do this.
- Boot into Philz Advanced CWM recovery and tap Wipe Cache/Data Partition and then wipe it. With Philz Advanced CWM, you can go to Wipe Cache/Data Partition options > Wipe for flashing new ROM option might work as well.
- If you have CWM, then boot into it and select the Wipe Data/Factory Reset option and do it.
- Reboot your phone now and it should boot up. In case if it fails, you will have to flash new stock firmware on your phone.
Method #3: Install Stock Firmware
At this point, you are completely out of luck and the only option that you are left with is the installation of a brand new Stock Firmware. Various guides for different brands are available on our site. Pick up the one that suits you and do it now.
- How to Install Stock firmware on LG devices using KDZ Flash Tool
- How To Flash Stock Firmware On Samsung Galaxy With Odin
- How To Unroot & Restore Stock Firmware On Sony Xperia Devices
That’s all. Let us know which method works for you. If you need any further help, reach us out through the comment box below.
tried to wipe data, and still got the “failed to mount ‘/data’ (invalid argument)
Try method 2 or 3.
I tried flashing a CM rom on my core prime and after i wiped data/partitions, and flashed the rom, the phone froze. When i restarted and tried to flash it again, it said unable to flash due to nincompatible data-try a factory reset . so i did just that. But now, all i get is this unable to mount data. I am using TWRP, Please help
I never switched ROMs. My phone (Galaxy s3) starts up normally. However, when I boot into TWRP (in order to flash SuperSU) it can’t mount System or Data.
I’m actually not rooted. I had rooted using KingRoot, flashed TWRP with Flashify, uninstalled KingRoot, and wanted to flash SuperSU from recovery. I had done this successfully on my previous S3.
Any advice?
Hi all. I’ve solved the error on mount /data only by using the format data button on twrp. I’ve tried all other methods here without success.
HI I NEED YOUR HELP !! I tried method two, but it appears to me as [no command] and it reboots again and again doing the same thing, what should I do ???