I've updated TinyUmbrella for iPad 2 GSM/CDMA users allowing them to restore
4.3.x without the fear of the recovery loop. Assuming you have 4.3, 4.3.1, 4.3.2, or 4.3.3 SHSHs and restore to one of those versions, TU will allow the restore to complete successfully.
It is important to note that I added this functionality so that iPad 2 users wouldn't be left without a way to downgrade to 4.3-4.3.3. It is also important to note that this functionality will only remain for so long as Apple signs the current firmware (4.3.4). Use it while you can! :)
Special thanks to @oLunatiko for his help in testing this release!