Tabuu
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iOS 8 isn't compatible with any A4 devices therefore all the people saying they can't do this because of the iOS 8 beta have no idea what they are talking about.This will only work on an iPhone 4, which doesn't have support for iOS 8, so you're fine.
Semi-Tethered & Semi-Untethered.
Let me explain it to you in lay mans terms, basically, a tethered jailbreak means you cannot restart the device, it simply won't boot. Untethered means you can reboot the device and everything will work perfectly fine. Semi-tethered means you can reboot it but none of your cydia packages or tweaks will work and some of your stock apps won't work unless you "boot tethered" in the program.How are they both semi?