Anyone know about the downgrade iphone 3GS with 3.1.3 firmware?
i found a method how to downgrade the iphone..
but dont know how far does it works.
never try it.

Step #1 Extract the archive iRecovery and bring the application on your Desktop.

Step #2 Install “libusb-win32-filter-bin-0.1.12.1.exe” and keep the file on the desktop.

Step #3 Connect your iPhone via USB and put it in DFU mode (hold down the button “Power” and “Home” for 10 seconds then release).

Step #4 Restore and manually load firmware 3.1.3 (by pressing Shift + Restore and select the firmware you downloaded previously).

Step #5 Towards the end of recovery, the procedure will stop and return the iTunes error 1015. Neglect it.

Step #6 Click OK on the pop-up, Close iTunes and run the console by typing the following commands:
cd Desktop (or folder where you copied iRecovery)
iRecovery.exe-s
setenv auto-boot true
saveenv
fsboot
exit
Step #7 Unplug the iPhone from your computer and restart it by pressing the Power and Home until the Apple logo appears. Once turned on, connect to your computer, activate it and use it normally.

who got more experience about this?

This post has been edited by imrozx: Apr 24 2010, 06:43 AM

so u mean save to SHSH to saurik?
im still confusing.. .
how to know old bootrom and new bootrom?
what is SHSH?
hahaha
im new about iphone actually...