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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone 4 / 4S

iPhone 4 / 4S iPhone 4 / 4S

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Old 07-28-2012, 08:48   #1 (permalink)
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iphone 4 error 21 during restore

iphone 4 error 21 during restore
pls any xpert to helo me out
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Old 07-28-2012, 14:27   #2 (permalink)
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try with battery to change or charging dock sometime works sometime not
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Old 07-28-2012, 18:21   #3 (permalink)
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error 21 used to be happened because of antivirus programs,try to stop them before restore...and used to be hardware problems but rare
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Old 07-31-2012, 19:37   #4 (permalink)
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tried de above still not working
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Old 07-31-2012, 20:00   #5 (permalink)
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change battery..put dfu mood via ibr..when u update used tiny umbrella online update

if u get any error restore customfrim ware ..try this pm me...
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Old 08-01-2012, 05:14   #6 (permalink)
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if it still stay in recovery mode (DFU Mode) you have to looking 2 things with hardware problem

1. IC Power
2. Baseband Chip
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Old 08-01-2012, 06:00   #7 (permalink)
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hard ware problem change the buttry and Jack cable
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Old 08-01-2012, 06:02   #8 (permalink)
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basband rrleted problem chack in hardware
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Old 08-01-2012, 07:19   #9 (permalink)
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use latest firmware also check this

c:windows/system32/drivers/etc/hosts
open it with notepad
if you see #74.208.10.249 gs.apple.com please delete it and save!
pleaee restart windows open itune restore again!
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Old 09-01-2014, 17:41   #10 (permalink)
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Disconnect and Reconnect battery
Tessted 1000%

BR
Lahoot
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