See what works for you. You can get B7P9 here:
Brian23, you have an OEM drive (like I do)--to convert from G*** firmware(oem) to B*** firmware(retail) you have to follow a few steps... I can post them later if you need them. I personally have had alot of issues with my 1620 oem, converted to retail B7P9, but it seems like most other people have found B7P9 to be the best. Maybe you should try it, and if it doesnt work try B7T9 (what I'm using now).