I have an iPhone 4, with iOS 5.0.1 installed - it's also jailbroke using redsn0w (untethered). It's running extremely sluggish lately, and there's so much junk on there so I just want to completely restore and start again. I'm a bit nervous of doing so as I need my untethered jailbreak, mostly because I'll be tethering my iPad to it using PdaNet. So this means I can't update to 5.1 yet,. What are my options here? Is Apple still signing 5.0.1 IPSW's? Or do I need to go about some other way?