Default [Q] Flashing modems, roms for Note 3 Int'l

Hi,

So I will be buying the Note 3 - N9005 (Int'l version)!

How would I go about flashing the T-mobile modem, to enable AWS HSPA+ bands + LTE bands?? And Flashing stock roms from other carrier like maybe ATT or Bell (Canada)! All of this is possible on the N9005?

Thank you !