I had everything working fine on my macbook (keychain, certificates, profiles
etc) for some reason I lost everything on my macbook including the backup of my certificates that I should use in the keychain assistant, currently I am working on installing the latest version of mac os and iphone sdk and xcode in order to develop for iphone 4. But I dont know what should I do to restore my settings and certificates or did I lose it all or what ? I am very confused so please advise.