iPhone Error 21/1600 Restoring Jailbroken iPhone 4

Just to be sure - you're just restoring (not option/shift + restore) to install a downloaded or custom IPSW?

Have you tried disconnecting & rebooting the computer, the tryin again? Have you tried a hard reset (power & home together)?

What is the current status? Stuck in recovery/at apple logo? Back to stock springboard?

What was your previous software other than 5.1? Unlocked? IPad baseband? Please elaborate just a bit more & I'm sure someone here will have a good suggestion for you.

macman1059 said:

In my first attempt I just did a stock standard restore but in the 2nd and 3rd I was using a downloaded IPSW from felixbruns.de



I fixed recovery using tiny umbrella and the phone is operating normally (jailbroken).



It's a factory unlocked iPhone which was running 5.1.

Click to expand...

Try using an IPSW downloaded from iClarified.com or the iphoneWikia. Try using Redsn0w if you're re-Jailbreaking.

Have you tried entering owned DFU mod with redsn0w? I just had this happen earlier this week and I was able to restore with that method.

Edit: nevermind, i saw that you tried owned dfu mode.

Make sure your host file is set to apple instead of cydia.

Open TinyUmbrella, go to advanced, UNcheck set host to cydia and close TU.

In redsn0w Extras put phone into pwned-DFU, try again with ALT-restore in itunes with your stock IPSW.

just to be sure, there are 3 different mode; recovery, DFU and pwned-DFU.

Error 21 fix!

DO EXACTLY WHAT TriJetHero SAYS!!! THIS CORRECTED THE ERROR 21!! YOU MUST DOWNLOAD TINYUMBRELLA AND UNCHECK THE "SEND SSH TO CYDIA" BOX AND "SET HOST TO CYDIA" BOX. THIS WILL ALLOW YOU TO DO A RESTORE! THANK YOU SO MUCH!!

Armofgold85 said:

DO EXACTLY WHAT TriJetHero SAYS!!! THIS CORRECTED THE ERROR 21!! YOU MUST DOWNLOAD TINYUMBRELLA AND UNCHECK THE "SEND SSH TO CYDIA" BOX AND "SET HOST TO CYDIA" BOX. THIS WILL ALLOW YOU TO DO A RESTORE! THANK YOU SO MUCH!!

Click to expand...

This is the FIX!!! Thank You!!

Uncheck Set host To Cydia on Tiny Umbrella

if you ahve tiny umbrella installed you need to open it click on advanced and uncheck the set host to cydia on exit....then try a fresh restore with itunes it should work!!! did for me! i was restoring a jailbroken iphone 4s on 5.1.1
Hope this Helps! thanks

TriJetHero said:

Make sure your host file is set to apple instead of cydia.

Open TinyUmbrella, go to advanced, UNcheck set host to cydia and close TU.

In redsn0w Extras put phone into pwned-DFU, try again with ALT-restore in itunes with your stock IPSW.

just to be sure, there are 3 different mode; recovery, DFU and pwned-DFU.

Click to expand...

Yep, this.

TriJetHero said:

Make sure your host file is set to apple instead of cydia.

Open TinyUmbrella, go to advanced, UNcheck set host to cydia and close TU.

In redsn0w Extras put phone into pwned-DFU, try again with ALT-restore in itunes with your stock IPSW.

just to be sure, there are 3 different mode; recovery, DFU and pwned-DFU.

Click to expand...

Every time I open TU, it gets stuck on "verifying libraries"

You my friend TriJetHero actually are a true hero!!! You rock!!!

I love you man! TriJetHero is god!

TriJetHero said:

Make sure your host file is set to apple instead of cydia.

Open TinyUmbrella, go to advanced, UNcheck set host to cydia and close TU.

In redsn0w Extras put phone into pwned-DFU, try again with ALT-restore in itunes with your stock IPSW.

just to be sure, there are 3 different mode; recovery, DFU and pwned-DFU.

Click to expand...

DJPABZ23 said:

Every time I open TU, it gets stuck on "verifying libraries"

Click to expand...

Do you have a Mac? I've seen that happen on those computers no matter the version.

Anyway, on my computer, I had to physically edit the hosts file every time I opened TinyUmbrella. You probably don't even use the hosts file for anything, so you can probably delete it, in which case any program that uses it will recreate it, but you should run Notepad as an Administrator, browse to the C:/Windows/System32/drivers/etc/hosts directly, and then change the option from Text Document to All Files to make the hosts file appear. You should see a couple lines in there and just put a # in front of anything that says gs.apple.com. I wouldn't advise erasing the file if you have other entries in there as you probably won't remember to check it if you get network errors with other programs.

iPhone4 restore

thanks for the advises I am also getting similar error with iPhone4 restore. My iPhone was previously running on iOS 5.1.1 and was jailbroken using absinthe, it was running good previously..one day I was stopped working and whenever i connect to the computer apple logo is appearing for sometime and disappearing there after continuously... I am bit confused and tried to restore the iOS but getting an error 21. I tried to enter DFU pwned mode and tried to restore getting similar error. Then I read solution from this thread and downloaded TinyUmbrella 5.11.01 and if I run it It is detecting the device but I am unable make changes to the "UNcheck set host to cydia" in advanced because it was masked off not enabling me to check/ uncheck. please help me in this regards, thanks for your valuable suggestions. awaiting for your replies..

TriJetHero said:

Make sure your host file is set to apple instead of cydia.

Open TinyUmbrella, go to advanced, UNcheck set host to cydia and close TU.

In redsn0w Extras put phone into pwned-DFU, try again with ALT-restore in itunes with your stock IPSW.

just to be sure, there are 3 different mode; recovery, DFU and pwned-DFU.

Click to expand...

I received an error also while restoring, I used tiny umbrella to get it out of restore mode and noticed this thread after however, I have yet to try again.

Makes me wonder though..Why would the Jailbreak change it to Cydia, doesn't that mean if something happens to your phone and you are forced to restore you essentially have a bricked phone?

Except for a sudden hardware failure, an iPhone cannot be bricked.
They can always be restored.
These errors are all due to operator inexperience.

dhlizard said:

Except for a sudden hardware failure, an iPhone cannot be bricked.
They can always be restored.
These errors are all due to operator inexperience.

Click to expand...

I have heard of many cases where the phone is stuck on the apple logo and won't boot to the screen.

this would be one instance where you couldn't get it to the springboard and make the change in tiny umbrella right?

Phones that are stuck and won't boot just need to be restored.

TinyUmbrella has nothing to do with a restore or booting other than as a tool to change where your host file points or for exiting recovery mode

TinyUmbrella should not be open or running during a restore.

dhlizard said:

Phones that are stuck and won't boot just need to be restored.

TinyUmbrella has nothing to do with a restore or booting other than as a tool to change where your host file points or for exiting recovery mode

TinyUmbrella should not be open or running during a restore.

Click to expand...

you are missing my point, people are having issues restoring because the host file is stuck on Cydia, so if you can't boot, you can't get into your phone to change the host file. therefor you are screwed

anyway, whats the point of having Cydia as the host file? What does it do?

eclipse01 said:

you are missing my point, people are having issues restoring because the host file is stuck on Cydia, so if you can't boot, you can't get into your phone to change the host file. therefor you are screwed

anyway, whats the point of having Cydia as the host file? What does it do?

Click to expand...

Unfortunately, you are missing the point !
The host file is in your computer, not in iDevice.
A host file can never be "stuck on Cydia". TinyUmbrella or tools like Terminal can always change it, followed by dumping the browser cache.
Since firmware manipulations are completed using a computer, often wiping/over-writing all content on the phone, the host file could not possibly be contained on a drive you are restoring.

dhlizard said:

Unfortunately, you are missing the point !
The host file is in your computer, not in iDevice.
A host file can never be "stuck on Cydia". TinyUmbrella or tools like Terminal can always change it, followed by dumping the browser cache.
Since firmware manipulations are completed using a computer, often wiping/over-writing all content on the phone, the host file could not possibly be contained on a drive you are restoring.

Click to expand...

ohhhhhhhhhh I didn't know that, I guess that was my original question, just took a while for you to understand it (completely my fault).

Thanks

error 21

Hello everyone

So I have a iphone 4 with the same problem ERROR 21

I tried all you guys are saying just one thing to try the umbrella part, I will try when I get home today. However I will explain the problem I'm having and hope someone can bring light to this dark place

So I buy this iphone 4 as faulty, cheap... I new the phone was stuck in in restore and I was thinking that all it needed was to plug and restore , nothing is easy in live, and this is no different. So if I plug the phone to the wall or PC I get the apple logo, but this is my head cracker, if the phone is not connected the phone will not turn on, nothing happens not if I press the power and home button. I now the battery is fully charged so it should power on, but it does not, only if connected to wall or PC. Is this normal? the phone doing this with error 21

So when I connect to PC and try to restore I will get the error 21, so I Google a fix and do as instructed. I deleted a ETC file and a different error appear, all I needed to do was update itunes, so I try again to restore but error 21 comes up again With or without ETC file (file is in recycle bin).

I think the phone must have been jailbreak... But if anyone have any ideas please help... I will try to do as u guys said but I'm new to this any instructions are welcome.

Thanks guys and sorry for the big love letter, LOL

It is your battery most likely. I had the same issue that phone would only stay powered when plugged in, and would get a fault code when trying to restore. Read another thread where fellow said to replace battery and like magic mine worked perfect when i did put another battery in.

Error 21 means you are not in DFU-mode.

Do you need an unlock?

First try to find out if the phone has any SHSH's saved.

Download TinyUmbrella

Connect phone
Open TU

Go to the advanced tab, make sure get shsh from cydia is checked
Now on the main page hit save SHSH

ok guys, I have the 1600 code error and I tried the first 2 paged of results with fixes on google and haven't managed to fix it. I saw some ppl saying that I must uncheck that things in TinyUmbrella, but I don't have acces to them, just can't change whether they are checked or unchecked. Any ideas?