Downgrade IOS5 Beta Baseband 04.11.08 to 04.10.01

Downgrade 4.11.08 to 4.10.01 baseband on iOS 5.0.1 .
A dream which begin to look like unreliable perhap . since this information leaked . we all ( blogger , Jailbreakers , iPhone Owner ) stay  searching to know more about it fiability . we still searching over net to see if this downgrade work realy . we serached to get procedure steps . searched just a Confirmation.but we got nothing as positive result . nobody showed Movie or picture about this one .for avoid us to stay waiting useless some genius peoples decide to bring us their analyse on this confused situation .
these alyses are based on some technical detail which proof unreal this Downgrade possibility .
if you takes most time to read and try understand , sure you will get same conclusion as us .
our conclusion is  it seem be unfiable this one but we keep seek reliable .

Let's Downgrade!

1. Download the 4.3.5 firmware from our sticky here - iPhone4S
5.1 http://appldnld.apple.com/iOS5/041-1...9_Restore.ipsw
5.0.1 (9A406) http://appldnld.apple.com/iPhone4/04...6_Restore.ipsw
5.0.1 (9A405) http://appldnld.apple.com/iPhone4/04...5_Restore.ipsw
5.0 http://appldnld.apple.com/iPhone4/04...4_Restore.ipsw

iPhone4 GSM
5.1 http://appldnld.apple.com/iOS5/041-1...6_Restore.ipsw
5.0.1 http://appldnld.apple.com/iPhone4/04...5_Restore.ipsw
5.0 http://appldnld.apple.com/iPhone4/04...4_Restore.ipsw
4.3.5 http://appldnld.apple.com/iPhone4/04...1_Restore.ipsw
4.3.4 http://appldnld.apple.com/iPhone4/04...2_Restore.ipsw
4.3.3 http://appldnld.apple.com/iPhone4/04...2_Restore.ipsw
4.3.2 http://appldnld.apple.com/iPhone4/04...7_Restore.ipsw
4.3.1 http://appldnld.apple.com/iPhone4/04...4_Restore.ipsw
4.3 http://appldnld.apple.com/iPhone4/04...0_Restore.ipsw
4.2.1 http://appldnld.apple.com/iPhone4/06...8_Restore.ipsw
4.1 http://appldnld.apple.com/iPhone4/06...7_Restore.ipsw
4.0.2 http://appldnld.apple.com/iPhone4/06...0_Restore.ipsw
4.0.1 http://appldnld.apple.com/iPhone4/06...6_Restore.ipsw
4.0 http://appldnld.apple.com.edgesuite....3_Restore.ipsw

iPhone4 CDMA
5.1 http://appldnld.apple.com/iOS5/041-1...6_Restore.ipsw
5.0.1 http://appldnld.apple.com/iPhone4/04...5_Restore.ipsw
5.0 http://appldnld.apple.com/iPhone4/04...4_Restore.ipsw
4.2.10 http://appldnld.apple.com/iPhone4/04...0_Restore.ipsw
4.2.9 http://appldnld.apple.com/iPhone4/04...1_Restore.ipsw
4.2.8 http://appldnld.apple.com/iPhone4/04...1_Restore.ipsw
4.2.7 http://appldnld.apple.com/iPhone4/04...3_Restore.ipsw
4.2.6 http://appldnld.apple.com/iPhone4/04...0_Restore.ipsw

iPhone3GS
5.1 http://appldnld.apple.com/iOS5/041-1...6_Restore.ipsw
5.0.1 http://appldnld.apple.com/iPhone4/04...5_Restore.ipsw
5.0 http://appldnld.apple.com/iPhone4/04...4_Restore.ipsw
4.3.5 http://appldnld.apple.com/iPhone4/04...1_Restore.ipsw
4.3.4 http://appldnld.apple.com/iPhone4/04...2_Restore.ipsw
4.3.3 http://appldnld.apple.com/iPhone4/04...2_Restore.ipsw
4.3.2 http://appldnld.apple.com/iPhone4/04...7_Restore.ipsw
4.3.1 http://appldnld.apple.com/iPhone4/04...4_Restore.ipsw
4.3 http://appldnld.apple.com/iPhone4/04...0_Restore.ipsw
4.2.1 http://appldnld.apple.com/iPhone4/06...a_Restore.ipsw
4.1 http://appldnld.apple.com/iPhone4/06...7_Restore.ipsw
4.0.2 http://appldnld.apple.com/iPhone4/06...0_Restore.ipsw
4.0.1 http://appldnld.apple.com/iPhone4/06...6_Restore.ipsw
4.0 http://appldnld.apple.com.edgesuite....3_Restore.ipsw
3.1.3 http://appldnld.apple.com.edgesuite....8_Restore.ipsw
3.1.2 http://appldnld.apple.com.edgesuite....1_Restore.ipsw
3.1 http://appldnld.apple.com.edgesuite....4_Restore.ipsw
3.0.1 http://appldnld.apple.com.edgesuite....0_Restore.ipsw
3.0 http://appldnld.apple.com.edgesuite....1_Restore.ipsw

iPhone3G
4.2.1 http://appldnld.apple.com/iPhone4/06...8_Restore.ipsw
4.1 http://appldnld.apple.com/iPhone4/06...7_Restore.ipsw
4.0.2 http://appldnld.apple.com/iPhone4/06...0_Restore.ipsw
4.0.1 http://appldnld.apple.com/iPhone4/06...6_Restore.ipsw
4.0 http://appldnld.apple.com.edgesuite....3_Restore.ipsw
3.1.3 http://appldnld.apple.com.edgesuite....8_Restore.ipsw
3.1.2 http://appldnld.apple.com.edgesuite....1_Restore.ipsw
3.1 http://appldnld.apple.com.edgesuite....4_Restore.ipsw
3.0.1 http://appldnld.apple.com.edgesuite....0_Restore.ipsw
3.0 http://appldnld.apple.com.edgesuite....1_Restore.ipsw
2.2.1 http://appldnld.apple.com.edgesuite....1_Restore.ipsw
2.2 http://appldnld.apple.com.edgesuite....7_Restore.ipsw
2.1 http://appldnld.apple.com.edgesuite....6_Restore.ipsw
2.0.2 http://appldnld.apple.com.edgesuite....1_Restore.ipsw
2.0.1 http://appldnld.apple.com.edgesuite....8_Restore.ipsw
2.0 http://appldnld.apple.com.edgesuite....7_Restore.ipsw

iPhone (Original)
3.1.3 http://appldnld.apple.com.edgesuite....8_Restore.ipsw
3.1.2 http://appldnld.apple.com.edgesuite....1_Restore.ipsw
3.1 http://appldnld.apple.com.edgesuite....4_Restore.ipsw
3.0.1 http://appldnld.apple.com.edgesuite....0_Restore.ipsw
3.0 http://appldnld.apple.com.edgesuite....1_Restore.ipsw
2.2.1 http://appldnld.apple.com.edgesuite....1_Restore.ipsw
2.2 http://appldnld.apple.com.edgesuite....7_Restore.ipsw
2.1 http://appldnld.apple.com.edgesuite....6_Restore.ipsw
2.0.2 http://appldnld.apple.com.edgesuite....1_Restore.ipsw
2.0.1 http://appldnld.apple.com.edgesuite....8_Restore.ipsw
2.0 http://appldnld.apple.com.edgesuite....7_Restore.ipsw
1.1.4 http://appldnld.apple.com.edgesuite....2_Restore.ipsw
1.1.3 http://appldnld.apple.com.edgesuite....3_Restore.ipsw
1.1.2 http://appldnld.apple.com.edgesuite....b_Restore.ipsw
1.1.1 http://appldnld.apple.com.edgesuite....a_Restore.ipsw
1.0.2 http://appldnld.apple.com.edgesuite....8_Restore.ipsw
1.0.1 http://appldnld.apple.com.edgesuite....5_Restore.ipsw
1.0.0 http://appldnld.apple.com.edgesuite....a_Restore.ipsw

2. Ensure your hosts file is pointing at Apple. You can do this easily with TinyUmbrella. Simply open it, switch to the Advanced tab, UNTICK the option "Set Hosts to Cydia on Exit", and then exit TU. DO NOT USE TU FOR ANY OTHER PART OF THE PROCESS!
Alternatively you can edit your hosts file manually if you are so inclined. Ensure you remove all lines which refer to gs.apple.com.

3. Connect your iPhone to your PC and put it into DFU mode.
4. Open iTunes, which will recognise your iPhone in recovery mode, acknowledge the message about this, then press shift-restore (Windows) or option-restore (OSX), and select the 4.3.5 firmware you downloaded in step 1.

5. If you followed the instructions, the restore to 4.3.5 should now complete without any errors. When it is complete you will have a stock 4.3.5 iPhone4 again with a downgraded 04.10.01 baseband. Bonus!

Here are my before and after "About" screenshots showing that the baseband was downgraded (as well as the differences in About screens between the versions!).
Remember, the baseband cannot normally be downgraded, however because Apple are signing both the beta and current firmwares, and their associated basebands, it is possible, but only until the official release of IOS5.



Now you should be able to go on further (if required) and downgrade 4.3.5 to 4.3.3, IF you have saved SHSH Blobs for 4.3.3 available. Because your baseband has been downgraded to 04.10.01 you will not end up in a nasty recovery or DFU loop. Remember, there is no way to downgrade further unless you have saved SHSH Blobs.
Happy baseband downgrading fellow jailbreakers!