error 21 on iphone 4 restore
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the problem often lies within the user's end, but still most Apple fans get an iPhone for the hassle free experience which is less common on Android; and such errors do really hurt the Apple reputation. However, iTunes error 21 often shows up while an iPhone or iPad http://www.unlockboot.com/2015/12/how-to-fix-itunes-error-21-when-restore.html iOS update is attempted using iTunes. The problems don't have any specific one-button fix, thus users will have to take the hit & miss path to test each and every possible solutions to succeed. Here are seven easy fixes which http://forum.gsmhosting.com/vbb/f456/error-21-iphone-4s-1847046/ are most likely going to work and fix iTunes error 21. How to Fix iTunes Unknown Error 21 Below are posted the top 7 methods to fix iTunes error 21 when you restore or update your iPhone: 1. Restart iTunes error 21 iTunes isn't very perfect even till yet, it often tends to act very buggy. iTunes error 21 could be a result of a faulty session. There could be other reasons like a disrupted connection between the iPhone and iTunes in midst of the update which resulted into a temporary corruption of update files, potentially leading into unknown error 21. Other similar sort of issues might just arise in a matter of moments. Restarting iTunes is the best possible solution in iphone 4 restore such cases; as it resets some values and bits underneath to bring things back to normal. 2. Update iTunes Is your iTunes the latest version from Apple? With update in iOS and every other software, iTunes needs to be updated as well. Especially if your iPhone is running the latest iOS and your iTunes is few generations older - many errors like error 21 are very likely to appear every now and then. There are probably a lot of conflicts happening underneath triggering errors. 3. Disable Antivirus for a While Updates require internet access. Though it's very unlikely to happen, yet your security program could list iTunes as a malicious program and block all incoming and outgoing data traffic through this app. As a result, updating iPhone via iTunes will be interrupted. Check your antivirus block list for such case, or simply disable it for a while. 4. Check Host File Check if the .hosts file doesn't block the Apple's servers. To do that you need to open your hosts file. Check this guide if you are a Mac user & check this guide if you are a Windows user. 5. Unplug USB Devices you Don't Need Unplug every USB device from your computer that you don't need, especially other smartphones or storage drives. Those devices could create conflict and make iTunes unable to detect an iPhone. There could be issues like difficulty in voltage management in older
search our database of over 8 million posts. Registration is fast, simple and absolutely free so please - Click to REGISTER! If you have any problems with the registration process or your account login, please contact contact us . GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone 4 / iPhone 4S error 21 iphone 4s User Name Remember Me? Password Register FAQDonate Forum Rules Root any Device ★iPhone Unlock★ -= Z3X JTAG =- Today's Posts .: For Rent :. Search iPhone 4 / iPhone 4S iPhone 4 / 4S Search Forums Show Threads Show Posts Advanced Search Find All Thanked Posts Go to Page... LinkBack Thread Tools Display Modes 08-11-2014, 22:34 #1 (permalink) Bennybongo Junior Member Join Date: Mar 2012 Posts: 3 Member: 1732168 Status: Offline > Thanks Meter: 0 error 21 iphone 4s hi everybody. i have an iphone 4s which gets error 21 while restoring. phone does not power on when not connected to power. will go between off and apple logo when plugged in and will stay on connect to itunes when manually put into recovery. already replaced battery twice. thank you for help. 08-17-2014, 21:20 #2 (permalink) Bennybongo Junior Member Join Date: Mar 2012 Posts: 3 Member: 1732168 Status: Offline > Thanks Meter: 0 has anybody got ay idea on this? 11-09-2014, 12:14 #3 (permalink) ADJESSA Junior Member Join Date: Nov 2014 Posts: 39 Member: 2286943 Status: Offline > Thanks Meter: 0 Error 21 and 11 Error 21 and 11 usualy harware problem chech fine your harware and try again.... 11-09-2014, 14:41 #4 (permalink) Tariq_stanikzai Insane Poster Join Date: Jan 2013 Location: Afghanistan Posts: 65 Member: 1876831 Status: Offline > Sonork: 100.1626615 Thanks Meter: 4,294,967,295 iTunes Error Collection With Solutions [DISCUSS] 11-11-2014, 18:29 #5 (permalink) softmind Freak Poster Join Date: Oct 2014 Location: india ( Punjab ) Posts: 173 Member: 2271772 Status: Offline > Sonork: 100.1617675 Thanks Meter: 16 Handset connect with DFU Mode And Select File Manually With keyboard batten press Hope ur problem like 21 error solve ,If ur iphone face same error during dfu mode then this is hardware issue 11-12-2014, 17:08 #6 (permalink) nujin84 Junior Member Join Date: Mar 2014 Posts: 18 Member: 2141422 Status: Offline > Thanks Meter: 4 check battery or battery connection,,,, 11-26-2014, 15:28 #7 (permalink) pabloo81 Freak Poster Join Date: Apr 2004 Location: POLAND Ag