do you have problem to install apps from app-store when you have IOS 4.1???

you have 3G iPhone and there is no update after 4.2.1 and appstore require 4.3???

Install any app from applestore for 3g/3gs 4.1 or 4.2.1 ( GSM-DOCTOR )
Method No1 a little Tricky
1. Jailbreak you'r IPhone/iPod/iPad
2. with IFile ---> System/Library/CoreServices ---> SystemVersion.plist
3. wth pc ---> itools ---> jailbroken data --- system/library/coreservice ---> systemversion.plist
4. Change BUILD version and Product Version ( for example u have 4.1 build 8B117 change to 5.0.1 or 5.1.1 ( 5.0.1 --- 9A405 or 5.1.1 --- 9B206)
5. Restart your IPhone
6. istall from Appstore will work 100% tested . ( not work Navigation GPS etc ).


Other Easy Method
here is a Trick to bypass this issue

Open cydia

go to sources and add this source

ihackstore.com/repo

now search for "firmware 4.3.4 fake" in cydia and install it


at home screen open "firmware icon"


click on your desired version and click Reboot.



now have changed your version





NOTE:

this is just a trick to bypass update message in appstore means this is not the real version at all.
the solution is no more work on 3G and iPhone (2G)

Step 1 : Restore latest version(with itunes) iPhone2,1_6.1.2_10B146_Restore ( after restore phone will in activation mode)

Step 2 : Open redsn0w_win_0.9.15b3

Step 3 : Extras > Select IPSW > iPhone2,1_6.0_10A403_Restore > Open

Step 4 : Back > Jailbreak

Step 5 : Select install ipad baseband & unselect install cydia > next > put dfu mode (redsnow instruction) after reboot phone will activated

Step 6 : Open  evasiOn 1.4 and press jailbreak (for untethered your jailbreak )

Step 7 : After jailbreak open Cydia > Manage > Sources > Edit > Add >repo666.ultrasn0w.com/
    
 ...............................OR.................................

Step 7 : Download ITOOLS & Ultrasn0w 1.2.8

Step 8 :After complete jailbreak open ITOOLS


Step 9 : connect phone to pc and open file system  >var>root>Media>Cydia>AutoInstall 
(If Cydia &  AutoInstall don't exist, create these folders as posted)

Step 10 : place the All DEB files(ultrasn0w 1.2.8)

Step 11 : And reboot phone normaly

Step 12 : After reboot your phone is UNLOCKED


more download links

hotfile : Ultrasn0w 1.2.8.
4share : Ultrasnow_1.2.8

hotfile : iTools.exe
4share : iTools.exe 


if you done with this way.... just like our page