It is advisable to stay away from 4.3.5 and 4.2.10 completely.
Apple has just released an update to iOS that patches a vulnerability with certificate validation. The update, version 4.3.5 (build 8L1), or 4.2.10 (for Verizon) is available to all devices compatible with the previous 4.3.4 update. Details of the update can be found here. It is, once again, not advisable to update. If you do decide to update, there is a jailbreak available for it, just point last weeks redsn0w to 4.3.4. This jailbreak is tethered and not recommended for normal users as it’s for kernel hackers only.
