I have a jailbroken iPhone 5s with IOS 7.0.6, and see that I now can't upgrade to anything except the non-jailbreakable 8.3. The only reason I jailbreak is to use iFile to silence the camera shutter sound (on Japanese iPhones you can't silence it unless you JB), and also to use f.lux and a couple of other small tweaks. But I've now seen things like OpenAppMkt which seems to claim to be a workaround, but there are so many scammy-looking sites talking about it that I can't find accurate information to know if it will do the job or if it's to be avoided. Does anyone know if iFile and f.lux can be used on an iPhone running IOS 8.3 through OpenAppMkt and its Cydia app? Thanks in advance for suggestions.