iPad 1, stock iOS 4.2.1, no SHSH blobs. Need advice on jailbreak.
so I've received my iPad 1 3G + WiFi last Friday and messed around a bit trying to jailbreak it but I failed to. I haven't kept up the pace with jailbreak related developments since the last jailbreak I made for my iPhone 2G with iOS 3.1.2 (7D11) a while ago so I wasn't aware of SHSH blobs deal at all and so I had to spend some time reading up on the subject.
My iPad 1 3G + WiFi runs stock iOS 4.2.1 that I'd love to jailbreak untethered. However, according to numerous pages that describe the process on the Internet, one would need IPSW file for iOS 4.2b3 AND SHSH blobs for that firmware. And I don't have no SHSH blobs at all.
I ran TinyUmbrella yesterday evening and it failed to save any SHSH blobs if I used Cydia as a fake gs.apple.com server. When using Apple native servers TU saved SHSH blobs for iOS version 4.3.5, and two more for iOS 5 betas.
So, to me it looks like I've no other choice but to upgrade up to stock 4.3.5 version of iOS and then do a tethered jailbreak with redsn0w (I don't have Mac OS X around). Then wait if untethered jailbreak will be made possible for iOS 5 some time in the future.
I have a few questions, though.
1. Why does TinyUmbrella fail to save any SHSH blobs with Cydia servers? Is this expected and normal?
2. If I do tethered jailbreak for 4.3.5 and my iPad reboots/halts while I'm on the road with no computer at hand will I be able to use iPad? It's just not clear to me what happens if you try to boot a tethered jailbroken iPad as usually without redsn0w. Will it bail out with some error or just boot stock version of iOS 4.3.5? If it boots a stock firmware and I do anything on it, like install new software via AppStore, change settings for iOS in General, etc. or change settings for some applications, and then boot tethered jailbroken iPad with redsn0w will all of those changes be reflected in jailbroken iOS?
3. If I do tethered jailbreak for 4.3.5, then Apple releases iOS 5, Dev-Team hopefully jailbreaks it untethered, and I do then upgrade to this yet non-existant untethered jailbreak for iOS 5 will I be able to keep all the accumulated changes and settings made in 4.3.5? Will I have to make a backup and restore from it, or, perhaps, iOS upgrade will not touch anything of the sorts (like apps, settings, iPod library, etc.)