So...jailbroken on 8.1, just went to blue screen of death a few minutes ago. Screen IS lit, but blank (not DFU, as near as I can tell). Does not respond to any buttons. iTunes doesn't see it. Neither does PhoneView. Options? (Glad I still have a working, JB'd iPhone 5. But this sucks, to have it happen right as 8.1.1 drops.) Edit: OK, tried at least a dozen times before posting, but this time a hard reset seems to have kicked it back into first normal behavior, then safe mode. I have some ideas on what to remove that I'll start with. That said...is this likely simply a temporary hiccup, or a hardware issue? I've never had this kind of thing with previous phones, so I'm working a bit blind here. Edit 2: Well, after removing a few things, including the most recent tweak, mikoto, it's running fine again. It did get VERY hot while blank-screened, and some nosing around on Google indicates a possible kernel-panic. The same symptoms apparently happened before on even some stock iPhone 6's that required replacement, which is not reassuring. LOL Edit 3: Reinstalled mikoto. Ran fine last night. This morning, rebooted on a hunch and sure enough, a blue screen crash followed by a bootloop. Getting into safemode required a couple of tries. Removed mikoto, tried again. Another bootloop. Booted again into safemode, went to Cydia & did a reinstall of Cydia Substrate. That seems to have cleared the issue; no bootloops now either on resprings or reboots. Reddit has mikoto listed as part of a "how to protect your 8.1 jailbreak" thread. Others (in the comments) are reporting issues similar to mine, some have had to redo their jailbreak to get the bootloops to stop. I'd personally suggest avoiding that particular tweak for now.