Fix Network Problems In Samsung Galaxy S2 Korean Version

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==Questions and Answers==
===Samsung S2 GT-I9100 null IMEI and unable to restore original IMEI number in EFS?===
''Hi, I have trawled the internet for a fix, many sites tried explaining a fix however only very dodgy. This is a friends device which I have managed to recover to carrier version but seems EFS folder is still corrupt. Do you have a reliable source for 'rooting and super user' for this device, then a decent EFS reader? Thanks''

Download a toolkit and on the rooted phone, use EFS PRO app to restore the corrupted files.

If you root your phone, you need to understand that things can go wrong. Rooting is not a process covered under warranty by Samsung, as it can cause issues to your phone that normally wouldn't happen if you didn't root. There is a way to return your IMEI number to normal; however, this requires unrooting your device or flashing the stock ROM again, since you likely didn't back up the IMEI number before you performed the rooting process. Plug your device back into your computer and run ODIN again. [http://forum.xda-developers.com/galaxy-s2/general/rom-guide-official-i9100-firmwares-lpe-t1075278 Download the stock ROM here]. Then, follow the instructions in ODIN to flash the stock ROM onto your device to return your IMEI number to normal.


===My question is regarding unknown base band version and unknown IMEI. My phone model is Samsung Galaxy S2 (SHW-M250K). Please help me to resolve this?===
''My question is regarding unknown base band version and unknown IMEI. My phone model is Samsung Galaxy S2 (SHW-M250K). Please help me to resolve this.''

You can fix your Galaxy S2 by installing Custom Stock ROM and then following the steps above in the answers using the toolkit.




===Fix my S2 GT-i9100 phone Baseband version?===
''Hi My Phone is SGS2 GT-I9100, I want to fix, Baseband version is Unknown. And IMEI is NULL/NULL. Please help me''


Here is the quick fix that you need for your Samsung Galaxy S2 GT-I9100 with unknown baseband version and null IMEI:

*First off, make sure that your phone is rooted and switched to "Airplane Mode".

*Install Busybox here --> https://play.google.com/store/apps/details?id=com.jrummy.busybox.installer

*Open your phone.

*Go to Settings >> Application >> Development >> check USB Debugging option.

*Connect USB cable to your phone to install the necessary drivers.

*Remove the USB Cable and the wait for your phone to power up completely. 

*Insert the UART cable to your device.



This will now get your baseband version up and running.



===My Galaxy S2 is showing null/null when I key in *#06# in dialer?===
''IMEI number issue, will you please help me''

#Dial *#197328640# or *#*#197328640#*#* on your phone like you did the *#06#.
#This will bring you into the Command mode.
#Select  Common.
#Choose (FTM) Field Test Mode and turn it OFF if it is on.
#The NULL or altered IMEI number will be restored.
#If you still are without an IMEI, go back to the Command screen and press the Menu key.
#Select Key input and enter the option 2 which will turn your FTM OFF again.
#Remove your battery and SIM card for two minutes, then place your battery in your phone but not the SIM card. #Turn on the device.
#Once the phone boots, enter the command mode again of *#197328640#.
#Choose the Debug Screen.
#Then phone control.
#Select NAS control.
#Click RRC (HSDPA).
#Choose RRC revision.
#Select Option 5 (HSDPA only).
#Turn off your phone and insert your SIM card. Check to see if your IMEI is restored now.

===Please, how can I rewrite my IMEI on my GTI9100?===
''I have a fake IMEI and I can't repair it, I want to write my IMEI that is labeled at the back of the phone''

You need to repair your EFS files as suggested in the above answer using the toolkit.


=== Can an update of Android 4 to 5 be reverted? ===
'' Actually, I have updated Android version 4 to 5 of my Samsung Galaxy S2. ''

It can be reverted but can also cause numerous problems such as those posted in the above answer. First, why do you not like the newest version because things like battery draining faster can easily be corrected? Try to determine what you are not liking and set up that newest version to your preferences.





[[Category:Samsung Galaxy]]
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