With the release of JailbreakMe 3.0
and Apple's response, iOS has been updated twice in order to patch the JailbreakMe exploit and other vulnerabilities. As mentioned in the iOS 4.3.4 article
, updating to iOS 4.3.4 is not recommended
as it only fixes the PDF exploit that JailbreakMe used. From there, Apple once again released a new version, 4.3.5
, to patch other issues that were found. Although redsn0w is now able to jailbreak both 4.3.4 and 4.3.5, it is also not recommended
as you will have to deal with a tethered jailbreak.