Here is also another zip that is known to bring 3g back to Argentina users on Personal (Thanks gederico):
Fix_3g_850.1900Mhz-signed.zip: 850, 1900MHz
Awesome! I now have a working Defy in the Movistar Argentina 3g/H network!
Even though out of the box, the unlocked Defy made in argentina did not work with Movistar Argentina, Froyo + this fix did work. Very weird bug.. but very cool fix!
NOW I'm happy about my defy!