[Q] Unlocking unactivated HTC First topic

So I found mint HTC First on eBay, the description says it's not activated and not unlocked.
My question is, can I buy it, export to Europe and unlock it using the hack posted here?
I don't have access to AT&T SIM card and never had AT&T account.

Can an unactivated HTC First be unlocked? Is there a way to bypass activation screen?