i phones tricks and tips

DEVICE FIRMWARE UPGRADE-DFU FOR IPHONES

DFU mode(Device Firmware Upgrade) mode is not the same as restore mode.
DFU mode bypasses the current OS installed and allows you to upgrade or
downgrade your OS. If you are getting errors trying to restore in
iTunes, DFU mode is very likely for you.



This is way to activate DFU mode. You can do it on every phone:



Attach the phone to the pc
Turn the phone off
Hold power and home together for *exactly* 10 seconds
Release power but keep holding home until the pc beeps as a USB device is recognized.
At no point will the display come on. Now your restore should work.


Having problems? Try adjusting the 10 seconds to be slightly less
like 9 seconds, then 8, then 7. It’s a tricky timing but you will
eventually get it.



Here is an alternate method:



Hook up the phone powered on to the PC
Now hold home / power until the phone turns off and keep holding
for 10 seconds. If the phone ever turns on during this phase,start over
and hold for less time.
Now release power and continue holding home until the PC recognizes the phone.
I don’t like this method as much because there are “rumors” that it
may cause some 1604 errors in the restore.

TAGS:HOW TO UPGRADE OR DOWNGRADE OS OR OPERATING SYSTEM IN IPHONES,ITUNES