The mysterious breakdown

i have an iPhone 5s jailbroken on 8.1.x i don't remember which one...but yesterday as usual the phone was drained out of battery and when i charged it and waited for it to reboot no response it made only the apple sign comes and then disappears ( goes into a boot loop) and F.Y.I i have Killios in my ifile but not installed it...can anyone help me...or even give me a way (doesn't matter if advanced or rookie way ) to get my data from my phone and then i will fix it but my data it precious...

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