Error 21 (and 1600 in DFU mode) when updating/restoring to iOS 5.0.1

Do you know if that will work if my phone keeps going back to restore? Every time I restore my phone it does not fully restore everything and Itunes won't let me out of the restore screen. I have been having problems since I updated my software, and now my Itunes App is not working well if at all, and will not play my songs? Any thoughst or ideas?

Hi Jayeshp

Thanks very much for reply

I was try to puy in DFU mode. Afterthat itune logo gone but battery logo stuck on screen.

itune is still not detecting iphone.

Please help me on the same

So what i understand is every time you restore your phone, it gets stuck in the itunes logo screen. Do you put your phone in DFU mode before you start a restore, because most of the times when you connect your phone to your computer, itunes pops up and asks if you want to update the firmware, if you click on update, then itunes wil extract the software and then prepare the phone for upgrade, while doing so, it turns off your phone and tries to put it in DFU mode, but most of the times it fails and it gets stuck in recovery mode instead, all you have to do is press and hold power and home button together until you see a blank screen on your phone and then release both buttons and wait for the phone to turn on.

If that doesnt work, fixrecovery or tinyumbrella is the thing for you.

Let me know if that doesnt work

I would say that this could be a good thing, we see the battery logo on the screen only when the phone is normally switched off, try turning it on like you always do and see if it turns on normally. Or you can follow the steps.

1. Turn on itunes.

2. Use fixrecovery ( its simpler and yields better output than tinyumbrella ) by downloading fixrecovery & zlib1.dll and saving these two files in the same folder.

3. Open command prompt and navigate to the location where you have saved fixrecovery executable.(For eg : C:/)

4. Now run fixrecovery (For eg : C:\>fixrecovery.exe).

5. It will prompt you to put your phone in DFU mode if you arent already in it.

6. If it does Press and hold power and home button for 10 seconds, then release only power button and continue holding the home button for another 10 seconds or until you see that fixrecovery has started executing.

7. Remember that if you release any of the power or home button in between the above steps while putting your phone to DFU mode, even for a split second, your phone will enter recovery mode and not DFU.

Let me know if it works for you

The gs apple host line actually was what was causing my iTunes errors when I did this...so I would leave these out if you're having issues after editing your hosts file

Are you 100% sure you're in DFU mode? Recovery Mode /=/ DFU.

I recommend using TinyUmbrella, and doing two things:

1. Enter DFU mode and select FixRecovery

2. In the Advanced Tab, Uncheck "Set all Hosts to Cydia" and "Request SHSH from Cydia", as leaving these checked will prevent communication to Apple's servers for a clean install.

HI

I am not able to start iphone 3g after red bettery sign come.

How do i know my phone is charging.

Please help............

HI

I am not able to start iphone 3g after red bettery sign come.

How do i know my phone is charging.

Please help............

Does your phone show a big battery symbol in the center of the screen when you plug it in to your usb or charger ? If it does then your phone is charging, and also the phone doesnt start if the battery has been completely drained, after a while when the battery has gets charged to about more than 5% it starts automatically, its a functional design, nothing to worry about