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iOS 4.0 iPhone 3G Wifi-Problems

Latest update: 2010/06/29

Conclusion:
After all the testing I have done on the device and having the 3G3 countertest, I'll assume that there is a bug in the baseband of iOS4 for the 3G, which handles wifi connection and/or dhcp handshake. If that bug is triggered the 3G4 can not anymore connected to any wifi network.
Setup:
  • AEBS — Apple Extreme Base Station
  • 3G4 — iPhone 3G with iOS 4.0 (8A293) Baseband 05.13.04, Model MB497DN
  • 3G3 — iPhone 3G with iPhone OS 3.1.3 (7E18) Baseband 05.12.01, Model MB497DN
  • MBP — MacBookPro

Useful links and discussions:

Wifi Overview List Wifi Error Alert for Open Network Wifi Error Alert for WPA2 Network
WifiTrak Overview List WifiTrak Detail View WifiTrak Try to connect WifiTrak Connect failed

2010/06/08 Installation iOS 4.0 GM

As developer I installed the golden master on my 3G4. Update worked and was usuable.

2010/06/25 - 2010/06/27 Wifi problem started

I was unable to get into my home wifi network anymore on 3G4. The other 3G3 worked with out any problems, also the MBP was working like a charm.

First I rebooted the AEBS, but the issue was not resolved. I am always able to see the surrounding wifi stations in the wifi settings. Also I can see these with the Wifi Tracker App. Whenever I try to enter one of the wifi networks I get the error message alert:

During all the tests I did, the MBP and 3G3 had NO problems to get into the network.

So here is what I did so far:

Reboot AEBS
No solution.
Reboot 3G4
No solution.
Airplane mode ON and OFF on 3G4
No solution.
Forget this network in the wifi settings on 3G4
No solution. But now I'm asked to enter the passphrase, entering it correctly still gets me to the error message.
Reset the network settings on the 3G4
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Change the network name on AEBS
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Change to OPEN (aka no encryption) AEBS
No solution. Still gets me to the error message.
Change to WEP (aka weak encryption) AEBS
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Change to WPA AEBS
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Change to WPA2 AEBS
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Downgrade to 3.1.3 on the 3G4
No solution. The downgrade was done according according to the script at Techlifezone – Downgrading iPhone OS 4.0 after a failed install.
Note: The Baseband was NOT downgraded.
Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Reboot AEBS
No solution.
Reboot 3G4
No solution.
Airplane mode ON and OFF on 3G4
No solution.
Forget this network in the wifi settings on 3G4
No solution. But now I'm asked to enter the passphrase, entering it correctly still gets me to the error message.
Reset the network settings on the 3G4
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Change the network name on AEBS
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Change to OPEN (aka no encryption) AEBS
No solution. Still gets me to the error message.
Change to WEP (aka weak encryption) AEBS
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Change to WPA AEBS
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Change to WPA2 AEBS
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Reupgrade to 4.0 on the 3G4
No solution. But now I'm asked to enter the passphrase, entering it correctly still gets me to the error message.
Reboot AEBS
No solution.
Reboot 3G4
No solution.
Airplane mode ON and OFF on 3G4
No solution.
Forget this network in the wifi settings on 3G4
No solution. But now I'm asked to enter the passphrase, entering it correctly still gets me to the error message.
Reset the network settings on the 3G4
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Change the network name on AEBS
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Change to OPEN (aka no encryption) AEBS
No solution. Still gets me to the error message.
Change to WEP (aka weak encryption) AEBS
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Change to WPA AEBS
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
Change to WPA2 AEBS
No solution. Still asked to enter the passphrase, entering it correctly and gets me to the error message.
2010/06/29
Found more discussions in the apple forum today.
2010/06/29 Planned visit at the Apple Store Munich — Genius Bar.
See what, they might find out.
2010/06/29 Apple store munich
We resetted the iPhone via DFU mode again and flashed the iOS4. Problems still there. Genius said, on base of his experience, that this is a hardware issue. I got a real good offer to exchange the hardware, which I did accept.