http://www.pioneer.eu/eur/support/software/AVH-2400BT/page.html
I have successfully updated my NORTH AMERICAN Pioneer AVH-P2400BT using the file from Pioneer's website. All meta-data is back, all controls are working as befor IOS 6. The issue of "clogging" when switching from Music to Podcast (because of the new Podcast APP) seems to have been addressed as well.
Pioneer's instructions for updating (Only available in Windows) are a bit kludgey, but if you read carefully, you can figure it out.
I D/L'd the update file to a desktop PC running Windows XP. I don't have a Windows product with Bluetooth capability, so I transferred the file to a USB thumb drive. I used my wife's MacBook to do the updating, following the Pioneer instruction sheet TO THE LETTER.Also, to make sure there were no interference issues, I POWERED DOWN my iPhone COMPLETELY.
When it came time to transfer the file from the MacBook to the AVH-P2400BT, I tried to drag-and-drop it from the thumb drive to the "update" folder in the AVH-P2400BT hierarchy. That did not work - I did get a brief "transfering" dialog window on the MacBook, but nothing actually happened. I had to use "Send File..." on the MacBook's Bluetooth menu and BROWSE to the update file on the thumb drive and the "update" folder on the AVH-P2400BT hierarchy. The file began to transfer - That took less than a minute and the AVH-P2400BT display changed to "Updating" after the transfer was complete. (Yes, there WAS a lost connection error message displayed on the MacBook, following the transfer - Pioneer's instructions say to ignore it. It's logical, because Bluetooth would have to be turned off to be updated.)
The "Updating" took a little over a minute, and the display went to "Completed". After verifying the correct software version, I powered up the iPhone and tested it. Thank you, Pioneer for taking care of your customers for an issue you didn't cause.
I am still very disappointed in Apple for "breaking" Bluetooth compatibility. Pioneer has made it right, but I know from reading all these forums that hundreds of other devices no longer function as desired or expected, and many will have no chance for a firmware update.