After installing Geohot's software unlock for 1.1.2/3 OTB, my iPhone was REALLY messed up.
It responded very badly, and the speaker was gone.
I decided to downgrade back to 1.1.1 and jailbreak him again, but that wan't as easy as I thought.

When I restored 1.1.1 with iTunes 7.4.2 I was getting errors like 1011 and my iPhone just woudn't respond anymore. I managed to get it bootup once, but it still didn't responded fast to my input on the keypad.
I decided to restore the phone to 1.1.3 (!), and suprisenly my iphone responded fast and the speaker worked again!

Next thing was getting 1.1.1 again working, in order to jailbreak the device.
I managed to get 1.1.1 restored with iTunes 7.5, got out of DFU mode with Independence and I jailbreaked it again:

From the start:

1. Connect your iPhone to your computer
2. If it doesn't show up in iTunes, then put it in DFU mode by pressing and holding both the Power button and the Home Button. After 10 seconds, the iPhone's screen will go black; let go of the power button, and continue holding the home button until iTunes displays a pop up. Click OK.
3. alt+click on restore, and point iTunes to the 1.1.1 firmware, and let it restore
4. When done, hopefully it displays the emergency screen, if not, eject the iPhone in iTunes, quit iTunes and bootup independence. Let it connect for a while and hopefully the iPhone is getting kicked out of DFU mode. If not, restore again
5. Slide to get to the emergency screen
6. Type *#307# and press Call
7. Now, if your iphone does NOT respond well on your input, and you don't hear the speaker anymore, restore to 1.1.3, and start again fromt he beginning !! (when restoring to 1.1.3, the baseband will be completely re-written, which fixes the encountered problems)
8. press the Back button on top of your screen to delete the just typed *#307#
9. Your phone will start ringing do not pick up
10. Delete all just typed numbers and type 0 then press call again
11. Your phone will ring again now press accept and then press hold
12. Your phone will ring again now press dismiss and your phone will go to the contacts/dial screen
13. Press contacts, add a contact without a name
14. For this contact you now have to add an URL (web adres):
    This has to be exactly: prefs://1F
15. Save your contact and click on the url, you will now get to the Settings menu in your iPhone
    where you select your WiFi and make sure the Auto-Lock is set to Never
16. Restart your iPhone
17. After your iPhone restart the Wifi icon should be back (indicating WiFi is working), if not then repeat step 1-10 again
18. If your WiFi does work repeat step 1-8
19. Now add another contact, with a different namen and with the URL: http://jailbreakme.com
20. Save this contact and
    Go to the URL you just saved (http://jailbreakme.com)
    and install appsnap.
21. Launch Installer.app
22. Install BSD Subsystem
23. Set Auto-Lock to Never
24. Install SoftwareUnlock for 1.1.2OTB and 1.1.3OTB (because the readme says, this can only be installed on 1.1.1
25. Scroll down to Tweaks (1.1.1), and install OktoPrep
26. Connect your device to your computer
27. Launch iTunes
28. Choose your device, alt+click on UPDATE, and select the 1.1.2 firmware file
29. Wait forever for your device to update reboot
30. Close iTunes
31. Download 1.1.2 jailbreakon Mac, double click on jailbreak.jar, on Windows, double click on windows.bat
32. Follow the on screen instructions and be patient
33. Now your iPhone is 1.1.2 jailbroken
34. Install iWorld
35. Done.

Sean @ 11.02.2008 17:53 CEST
THANKS!!! messed up my whole iphone, but this made my day!