iOS is rooted by default. The latest jailbreakable version is 4.3.5. But the latest untethered version is 4.3.3.
Applejuiced said:You need shsh blobs saved.
You can't just install whatever version you want.
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5)
So wait all this talk the Dev-team kept talking about shsh blobs and saving them, actully meant something? Well who would have thunk that.
So a prospective iPhone 4 buyer whom needs unlocked-JB needs to look for:
iOS4.2.1 or older
SHSH files (if one ever needs to restore to the same iOS)
specific Baseband