Apple is no longer signing the iOS 8.3 software update for all compatible iPhone, iPad and iPod touch devices, meaning that users can no longer downgrade to that version using iTunes. Apple is now only signing iOS 8.4 and later.
iPhone, iPad or iPod touch users that have jailbroken their device on iOS 8.3 should not worry about accidentally updating to iOS 8.4, as an untethered jailbreak is available for both software versions courtesy of Chinese tool TaiG.
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Just wishful thinking. :P