I want to restore an iPhone 4 to factory settings and I don't know the passcode
my sisters iphone 4 has a pincode she cannot remember i am trying to restore to factory settings
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See this Apple support link→If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support
Or watch this companion video ⬇️
After restoring the phone using one of the methods above you can restore your most recent backup.