unknown error (21) while restoring iPhoneunknown error (21) while restoring iPhone - GSM-Forum

bappi1 · 04-28-2011, 08:08

iPhone 3GS unknown error (21) while restoring

I have an iPhone 3GS and I am trying to upgrade to iOS 4.3.2 but it keeps giving me errors (21). I also tried using a custom firmware of 4.3.2 but that gave me the same errors (21). What can I do? help me out?

rajufzr · 04-28-2011, 08:28

First try with stock firmware 3.12 if not possible then try with stock firmware 4.1

chipset experts · 04-28-2011, 08:44

use red snow and go to dfu mode then try custem firmware...

blolyxx · 05-01-2011, 22:18

Quote:

Originally Posted by bappi1

iPhone 3GS unknown error (21) while restoring

I have an iPhone 3GS and I am trying to upgrade to iOS 4.3.2 but it keeps giving me errors (21). I also tried using a custom firmware of 4.3.2 but that gave me the same errors (21). What can I do? help me out?

What can I do? help me

xdown · 01-01-2012, 14:36

i got last time the same probme. i try it with with other pc and it worked! some time this problem caused by itunes. so reinstall itunes or try with other pc...

mozgur · 01-01-2012, 15:20

error 21 is hardware problem and this is solution try and write the resault
http://forum.gsmhosting.com/vbb/atta...2&d=1321623496

mlnteam · 01-01-2012, 17:48

check your Battery or PA damage

loft812000 · 01-01-2012, 19:09

well u must download IREB 4
1 close ut itune
2 run IREB
3 when u finish u open host file and u delete the last line
4 run itune and restore ( shift + restore )
and thats all

loft812000 · 01-01-2012, 19:14

host file you will go to your windows files
then system 32 > DIVERS > ETC
u ull find some files
the 1st one called hosts move it top ur desck then open it with bloc note
go to the last line delete it or just add # in the front then save changes and move again the host file to his place
and ur probleme is fixed

gulzarjan · 01-02-2012, 07:49

To fix iTunes error 21, you must put your iDevice into DFU mode using the following instructions:

Connect your iDevice to your PC or Mac via USB cable and launch iTunes.
Hold down the Home+Power button for 10 seconds.
After 10 seconds, release the Power button but keep holding the Home button until iTunes detect your iPhone in recovery mode.
Once your iDevice is in DFU mode, you should see nothing on its screen. It should be completely blank.

iSelliPhones · 01-02-2012, 08:04

It's usually hardware damage and goes along with error 9. If you can get past the error, the iPhone will either freeze on waiting for iPhone or shut off. Try with another computer to make sure it's not PC-related.

gsmtech_tr · 01-02-2012, 11:40

use 4.1 custom firmware baseband 6.15...

first ireb
delete hosts file last line....
open itunes
restore 4.1 custom firmware...

freeman2001 · 01-02-2012, 11:51

battery problem

wbr

04-28-2011, 08:08	#1 (permalink)
bappi1 Freak Poster Join Date: May 2007 Location: sylhet Posts: 462 Member: 517801 Status: Offline Sonork: 100.1594355 Thanks Meter: 316	unknown error (21) while restoring iPhoneunknown error (21) while restoring iPhone iPhone 3GS unknown error (21) while restoring I have an iPhone 3GS and I am trying to upgrade to iOS 4.3.2 but it keeps giving me errors (21). I also tried using a custom firmware of 4.3.2 but that gave me the same errors (21). What can I do? help me out?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
where to find a working program all they have some errors ??	fondas	Nokia Legacy Phones ( DCT-1 ,2 ,3 ,L )	2	12-12-2012 13:26
My 5110 v5.11 have a strange error.., it resets it self every 60second	luuk	Nokia Legacy Phones ( DCT-1 ,2 ,3 ,L )	24	08-11-2006 15:29
HEX for CLIP to restore Factory Defaults	X-Shadow	Nokia Legacy Phones ( DCT-1 ,2 ,3 ,L )	0	02-28-2000 15:59
The multiple errors of Winlock ... ???	Genata	Nokia Legacy Phones ( DCT-1 ,2 ,3 ,L )	0	09-20-1999 19:12
error (1002) simlock3.dll winopen	fondas	Nokia Legacy Phones ( DCT-1 ,2 ,3 ,L )	0	08-28-1999 15:57

04-28-2011, 08:28	#2 (permalink)
rajufzr No Life Poster Join Date: Feb 2005 Location: MX-KEY is the BEST NOKIA TOOL Age: 50 Posts: 875 Member: 116314 Status: Offline Thanks Meter: 147	First try with stock firmware 3.12 if not possible then try with stock firmware 4.1

04-28-2011, 08:44	#3 (permalink)
chipset experts Freak Poster Join Date: May 2010 Location: with~predators Age: 38 Posts: 388 Member: 1312914 Status: Offline Thanks Meter: 111	use red snow and go to dfu mode then try custem firmware...

01-01-2012, 14:36	#5 (permalink)
xdown Freak Poster Join Date: Sep 2008 Location: Germany Posts: 112 Member: 858721 Status: Offline Thanks Meter: 8	i got last time the same probme. i try it with with other pc and it worked! some time this problem caused by itunes. so reinstall itunes or try with other pc...

01-01-2012, 15:20	#6 (permalink)
mozgur Insane Poster Join Date: Nov 2004 Age: 47 Posts: 71 Member: 89550 Status: Offline Thanks Meter: 8	error 21 is hardware problem and this is solution try and write the resault http://forum.gsmhosting.com/vbb/atta...2&d=1321623496

01-01-2012, 17:48	#7 (permalink)
mlnteam Registered User Join Date: Jul 2004 Location: nonthaburi thailand Age: 51 Posts: 282 Member: 73464 Status: Offline Thanks Meter: 26	check your Battery or PA damage

01-01-2012, 19:09	#8 (permalink)
loft812000 Freak Poster Join Date: May 2009 Age: 42 Posts: 115 Member: 1039707 Status: Offline Thanks Meter: 11	well u must download IREB 4 1 close ut itune 2 run IREB 3 when u finish u open host file and u delete the last line 4 run itune and restore ( shift + restore ) and thats all

01-01-2012, 19:14	#9 (permalink)
loft812000 Freak Poster Join Date: May 2009 Age: 42 Posts: 115 Member: 1039707 Status: Offline Thanks Meter: 11	host file you will go to your windows files then system 32 > DIVERS > ETC u ull find some files the 1st one called hosts move it top ur desck then open it with bloc note go to the last line delete it or just add # in the front then save changes and move again the host file to his place and ur probleme is fixed

01-02-2012, 07:49	#10 (permalink)
gulzarjan No Life Poster Join Date: Jun 2008 Location: Bahawal Nagar Posts: 649 Member: 793565 Status: Offline Sonork: 100.1611436 Thanks Meter: 356	To fix iTunes error 21, you must put your iDevice into DFU mode using the following instructions: Connect your iDevice to your PC or Mac via USB cable and launch iTunes. Hold down the Home+Power button for 10 seconds. After 10 seconds, release the Power button but keep holding the Home button until iTunes detect your iPhone in recovery mode. Once your iDevice is in DFU mode, you should see nothing on its screen. It should be completely blank.

01-02-2012, 08:04	#11 (permalink)
iSelliPhones Insane Poster Join Date: Mar 2011 Posts: 62 Member: 1526994 Status: Offline Thanks Meter: 6	It's usually hardware damage and goes along with error 9. If you can get past the error, the iPhone will either freeze on waiting for iPhone or shut off. Try with another computer to make sure it's not PC-related.

01-02-2012, 11:40	#12 (permalink)
gsmtech_tr Junior Member Join Date: Jun 2009 Posts: 39 Member: 1059051 Status: Offline Thanks Meter: 10	use 4.1 custom firmware baseband 6.15... first ireb delete hosts file last line.... open itunes restore 4.1 custom firmware...

01-02-2012, 11:51	#13 (permalink)
freeman2001 No Life Poster Join Date: Dec 2005 Location: Barcelona Posts: 870 Member: 206476 Status: Offline Thanks Meter: 459	battery problem wbr