android how to

CWM Recovery – Can’t Mount System Error Solution [How To]

(Last Updated On: October 27, 2016)

CWM Recovery is considered as the major utility among rooted devices. But sometimes, in certain phones like Galaxy mini or Galaxy Ace shows error on system mounting. Thank God,it can be fixed quickly. Moreover, the possibility of getting troubled by the same error is very few.

The error is an expected one and happens generally when you are trying to backup a stock ROM using the clock work mod recovery. Please, note that you can’t do a completed nandroid backup of a stock firmwares. So, just install any custom ROM and then you can backup and restore anytime.

Clockworkmod Recovery Error
Messages Also, sometimes you also face errors as given below :

E: Can’t open /cache/recovery/log
E: Can’t mount /cache/recovery/last_log

E: Can’t open /cache/recovery


Such errors are normal when you visit clockworkmod recovery while on stock samsung firmware. Since
clockworkmod on galaxy mini is not fully compatible with stock ROM, you’ll get these errors.

Simply flashing a custom rom on your galaxy mini handset removes this messages from clockworkmod recovery.

However, if you don’t plan to install custom ROM, then it doesn’t make sense to install custom recovery like clockworkmod. So, I suggest removing it by flashing stock ROM via Odin which will overwrite clockworkmod recovery with stock android recovery.

Question :

Then, How do I backup my stock
Android firmware? What if I want to go back to stock ROM after flashing any custom rom?

Reply :

Well, the fact that you can’t backup a stock ROM could be troublesome if you want to return back to official stock firmwares on your handset. While some Samsung stock firmwares are
made available by sites like and, not all firmwares might be available.

Moreover, not all devices can install these leaked firmwares. Depending upon your handset and the fact whether Odin Multidownloader — a firmware flashing utility for Samsung smart phones — is available for it or not, there’s possibility that you can return to stock ROM.

If required flashing programs are available and if (upgraded) firmware is available for your region then you can download it, load it in Odin, reboot your handset to download mode and then flash/install it within few minutes and change your handset to make it look alike to that of the very first day you bought it.

That’s why it’s always recommended to keep the firmware details of your handset (you can dial *#1234#* Samsung secret code and get PDA, Baseband and CSC details of your current firmware).

If Odin or similar firmware flashing tool is not available for your handset, then I’d suggest you to think carefully before moving to any custom firmware.

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Sidharth Pk

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  • Manytimes system dont get mounted,
    In these situations in advanced options clearing the dalvik cache and attempting to restore the system in a-restore–advanced–system restore if I try this four to five time then finally it mounts and restores.
    When you see on external card through root explorer or on your pc especially after restoring the system, cwm recovery creates extra files and folders on sdcard like ttywm..exe. Android_secure and upto such five files maybe on the sdcard that may be a reason to delay to mount the system.
    I will suggest to create the initial backup on a fat32 formatted sdcard and see after full backup that what files are present in the card save those and zip all files.
    See how convenient you feel in restoring such a backup.
    Indeed you shall manually mount every thing like cache partition, system, boot, recovery, data manually, once it get mounted create the backup.
    Real problem is it doesn’t get mounted easily during a crash.
    Once it gets crashed, whatever format doesn’t matter if you have fully backed it up.
    Never delete your efs folder, it is your radio and antenna this is not backed up by any utility.
    Beware to clear or delete the cache partition it may have valuable information.
    Going to a custom rom may delete your system partition table info failure in such case,can not not be recovered.
    The final conclusion is to backup on a fat32 formatted scared and backup all files what are present on card even it is ttywm..exe file, may be that is useful to mount the system.
    Sd-ext is never get backed up because this is active at that time and back up is created on it.
    To not get the data errors you need to create, .android_secure folder on sdcard manually that will be seen through only root explorer not by common file explorer, as you will create it, it will get disappeared.

  • Please My Nubia Z7 Max Cannot Boot Up After Repartitioning internal memory
    The phone can boot up to recovery mode (custome Recovery), but whatever I try to do, it only displays this:

    E: can’t mount / cache / recovery / log
    E: can’t open / cache / recovery / log
    E: can’t mount / cache / recovery / last_log
    E: can’t open / cache / recovery / last_log
    E: can’t mount / cache / recovery / last_install
    E: can’t open / cache / recovery / last_install

    please help

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  • hello sir,
    sir i have MICROMAX CANVAS A311 i’m in trouble could anyone please help me…
    today i cleaned my systemto install new one but when i to go to intal new ‘custom rom’
    my custom recovery showing me

    your installation has been aboted during expected mounts are failed ;

    E: Can’t open /cache/recovery/log
    E: Can’t mount /cache/recovery/last_log

    E: Can’t open /cache/recovery last_log

    please help me i’m in big trouble cotact me on

    phone ; 8959454574

    email ;


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