TaiG 2.1.3 fixed Cydia Substrate issues, iTunes loading issues, missing or blank icons, etc. It is a highly tested and recommended untethered jailbreak tool for iOS 8.3, iOS 8.1.3, and iOS 8.2. This tool is windows only, but works with virtual machines on Mac OS X. It also works with the latest version of iTunes!

http://www.iosjailbreak8.com/

iOS 8.3 Jailbreak
TaiG v2.1.3 iOS 8.3
Bootrom
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TaiG 8.3 jailbreak
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