Upgrade Iphone 3gs From 4.1 To 6.1 With Easy Steps

Upgrade Iphone 3gs From 4.1 To 6.1 With Easy Steps
Note do it before STarting Everying :
 if your phone already in 4.1 firmware and you want to update it to latest firmware then downgrade the base band before staring restoring phone to latest firmware 
Have a lot of others method but i will post here easy steps
for those who like this 


(how to downgrade?)

use the latest redsnow (redsn0w_win_0.9.15b3) open it Choose Extra press Select IPSW and select there (iPhone2_1_4.1_8B117_Restore.ipsw)
press back button press jailbreak , and mark to downgrade from base band (only this option not others ) do next wait until all is complete 
Phone will be power on with downgrade base band 

Step 1 MAke custom Firmware using snowbreeze (sn0wbreeze v2.9.9 (For iOS 3.1.3, 3.2.x, 4.0.x, 4.1, 4.2.1 to 4.2.8, 4.3 to 4.3.3, 4.4.3, 4.4.4, 5.0.1, 5.0.2, 5.1.1, 5.2, 6.0.x, 6.1)
step 2 put the phone in DFU mode Using iREB-r6 download from here 

:ireb-r6 - Download - 4shared - munewochan 

after puting phone in DFU mode Open itune and connect phone and press restore phone 
step 3 after Restore Wait for Phone to Complete Power On , (it will take some time install cydia Etc )
step 4 After Complete Power on phone connect phone to wifi open cydia , manage and add there the Ultrasn0w Address (rep0666.ultrasnow.com)
step 5 Intall Ultra snow From There Are you can use other method to put file on AUTO install Folder Using Itool Ifunbox Etc Software 
DONE