I got similar wifi problem when I downgrade to 1.1.4 from 3.0. I noticed some wifi lag considerably while on 3.0, and decided to go to 1.1.4. It simply won't work.

Right now I am with 2.2.1.

I hope Apple is not disabling the wifi purposely for downgraders.


I did notice before, the iPhone got overheat while on 3.0. Found many discussion about some freezer trick. I hope this is not the case normally happened in notebooks/laptops when wifi mini pci-e dead after repeatedly overheat.

Updated:
I got on 3.0 back, and the wifi works.

This post has been edited by aifoninfo: Jul 2 2009, 07:50 AM

Press CTRL+ALT+Del

End these process:
* AppleMobileDeviceHelper
* AppleMobileDeviceService
* iTunes
* iPodService

Uninstall all Apple component software
* Apple Mobile Device Support
* Apple software update
* iTunes
* Bonjour
* Quicktime

Delete or rename My Documents\My Music\iTunes

* for fw 1.1.4 you will need iTunes 7.6
* for fw 2.2.1 you will need iTunes less than 8.2
* for fw 3.0 you will need iTunes 8.2

get it from www.oldversion.com

Use En__ZiPhone_patched_by_kIREmK_04.05.04_G.zip
Select
* Downgrade Baseband
* Debug boot
* iErase

Enter DFU mode, please be patient at this stage. Please refer to youtube DFU tutorial

Restore your firmware with proper version of iTunes

Jailbreak with proper tools

for fw 1.1.4 use iLibertySetup_1.3.0.113.exe
for fw 2.2.1 use QuickPwn-225-2.zip
for fw 3.0 use redsn0w-win_0.7.1.zip, if 0.7.2 is used; never use ICY or your Cydia will go berserk

This post has been edited by aifoninfo: Jul 2 2009, 11:52 PM