There are two options:
Flashing a ROM Stock 1- by odin, all you will lose root, then hang you as rootearlo again.
2 Flashing another ROM. In the first case, do that: - Activate the USB Debugging in Settings / Options for development. - Open Odin 1.85, making sure Kies is completely closed. We turn off the phone, reboot into Download Mode (Volume Down + Home + Power), connect it to PC and volume up to confirm.
- When you connect your phone with the PC we should see a yellow box in Odin, if not, we will install the Samsung drivers. - Unzip the '.tar.md5' the official firmware file.
- In Odin let the 'PDA' checkbox and select the previously decompressed file. We ensure that 'Re-Partition' is unchecked and give it to 'Start'.
- On when the word 'Pass' appears mean that the installation was successfully completed and our mobile, when we can disconnect from the PC and reboot.
FILES: -
https://www.wuala.com/dinamicamedia/Galaxy_S2/Odin3v185.zip/ -
https://www.wuala.com/dinamicamedia/Galaxy_S2/SAMSUNG_DRIVERS_USB.rar/
-
Http://d-h.st/DGL Rooting again: Download 1- what put you down and pass it to the root of the micro sd (recomiento this) in any folder above. 2 Turn off the terminal and turn this key combination: Vol up + Vol down + Power. 3 As early recovery, recovery and you're going to install from sd or whatever, you install the package you've been "Root_SuperSU.0.96.Only-signed.zip" and when finished, you turn back around and give it to reboot system now.
Install another rom, we can provar with CM for example: 1- Pass the rom and gapps. micro sd to the root "leave her out of a folder." Reboot to recovery 2. Make 3 wipes to data, system, cache and dalvik cache. 4 Go to install from sd and install first the rom and then the gapps. 5-Reset "reboot system now".
FILES: - CM:
http://mirror.wdc.cyanogenmod.org/jenkins/71644/cm-11-20140609-SNAPSHOT-M7-i9100.zip
- Gapps:
http://gapps.itvends.com/gapps-kk-20140105-signed.zip Then you would have to upgrade to version: 1- Settings -> Phone Information -> Cyanogenmod Updates.
2 Of the two fields, the second select and click on "new unstable incl." 3 Select an update to download and install again to "accept terms". The program will do the rest alone.
Or CM Installer, follow this tutorial but I did used for S2, Nexus 5, Nexus 4, etc updated version and then just as I have explained above.