This depends entirely on what version of the iPhone you have. If you have a 3G, you can still perform a restore to 3.0.1 and you can capture your iBSS and iBEC in the process.
If you have a 3GS, it's too late for you to do either. Be careful under no circumstances to restore your iPhone (it will be restored with 3.1). You can still jailbreak using redsn0w, and then record your ECID hash on Saurik's servers from within Cydia.