Do a software update on a mobile or Android tablet is never a very quiet operation. There are always risks involved. You should remove the partition data “\date” and “\cache”, clean the dalkik cache, and install again the Android inflating a zip file directly on the phone. There is always a small risk of causing trouble on the device, including disabling it for good.
In my case I had no choice. My phone UMI X 2 had problems connecting with 3 g network of vivo and a software update could help. After much reading on the subject came to the conclusion that the best way to update the Android on UMI X 2 It was via Clock Work Mod, a recovery software that makes the cleanups and updates easily.
If you plan to do the update of your phone UMI x 2 from the instructions in this text so pay ATTENTION! This should not be done unless you have a backup of your phone info (data, pictures, documents and other). Be also aware that it is possible to disable the device in the process, Although this is unlikely to occur if the instructions are made with care. Use this guide only at your OWN RISK!
The first thing to do is download the Clock Work Mod (CWM). It is different for each phone so don't try and download a generic. I used This file described This link. Download then the file “recovery.img” and place it in the root directory both the SD card and the internal memory of the phone.
If you want to update the Android, or as we say often ROM, You must then download it to the SD card from your phone. There are many different Android ROMs for the cell phone X 2 on the site UMI NeedROM. I used the newest I found, available This link (Update 07/17/2013). Download the ROM and put it in a directory on the SD card.
After download the software MobileUncle MTK Tools the market and run. You will see the menu of the image below:
This step will install the recovery CWM on your phone, and it won't make any update on Android. Yet if you've come this far and not backed up your phone you're risking losing everything. Needless to say, you need to have Root permissions to do this step.
Before doing anything connect your phone to the power supply or PC. The UMI X 2 does not accept enter in recovery mode without external power supply.
Access then the menu “RECOVERY UPDATE” the MobileUncle and the screen below will be displayed. The first file on the top must be the “recovery.img” What's on your SD card.
If you select the file “recovery.img” the program will ask if you are sure. Select OK on the image below and also asks if you want to reboot into recovery.
This is the screen of the CWM which will appear when the phone is rebooted. If you select the option “reboot system now” the phone will reboot your Android usually, without that nothing has been lost or modified. If you want to come again on this screen, to update the Android or make a backup, You must turn off the phone, plug it in the power supply, holdin' out for the animation of the battery being charged and press “VOLUME ” and “POWER” at the same time.
Within the interface of the Clock Work Mod, with the correctly chosen ROM ZIP file stored on your SD card, You must start the cleaning process (removing previous ROM) in the menu “ADVANCED” and after “WIPE DALVIK CACHE”.
Then you must select “WIPE DATA/FACTORY RESET” and then “WIPE CACHE PARTITION”. Ready, It's all clear to install the new ROM.
Now click “INSTALL ZIP FROM SD CARD” and select the chosen ROM ZIP file. After a few minutes the interface should show the message “ZIP INSTALLED”. And then select “GO BACK” and “REBOOT SYSTEM NOW”.
If everything worked you will have installed a new ROM, IE, another compilation of Android. Hopefully this new ROM may correct errors or problems that the phone had. In my case, began to work better the 3 g phone and front camera became 5 m pixels! I'm much more happy with the phone now, for all the faults that annoyed me were corrected. Good luck to anyone who wants to try the process, as it gives even a certain butterflies!