9 Answers

• If you run this from Terminal what do you get for output?

  /Developer/usr/bin/xcodebuild -showsdks
  

• hmmm I get this:

  Mac OS X SDKs:
      Mac OS X 10.5                     -sdk macosx10.5
      Mac OS X 10.6                     -sdk macosx10.6
  
  iOS SDKs:
      iOS 4.2                           -sdk iphoneos4.2
  
  iOS Simulator SDKs:
      Simulator - iOS 3.2               -sdk iphonesimulator3.2
      Simulator - iOS 4.0               -sdk iphonesimulator4.0
      Simulator - iOS 4.1               -sdk iphonesimulator4.1
      Simulator - iOS 4.2               -sdk iphonesimulator4.2
  

  so.. is it not possible to have more then one SDK installed at a time?

• Yes. I do not know of any easy way to get around this unfortunately. The older version of the SDK use to allow you to select the different versions and install them. I think that disappeared with iOS 4.0+.

• aye. Had to install the 'younger' SDK.. of course my phone is at 4.2. might try downgrading it this afternoon to see if I can get my app running on a phone..

• I did the same thing. I had my iPad and iPhone at 4.2 and downgraded so I can test.

• Hey John -

  Do you have mobileMe? Did you have any issues with it syncing to the phone after the downgrade?

• I have mobile me but I haven't tried syncing. I'll check in a bit and get back with you.

• Seems to be working for me.

• hmm cheers. I'll try re-setting up my account on there.. see what happens..

  thanks again.