Programming via USB

[Vacs]

I have a unmodified xv6800 on Verizon. I'd like to install radio 3.42.50 as a first step towards getting my GPS working. The procedures I've found described here require formatting a SD card and putting the new radio on it using a personal computer, then moving the SD card in the phone to program it. I don't have a way to read or write to a SD card with my computer so I can't go that route. There are procedures for updating the boot loader and programming a new ROM via the USB but not for Radio upgrading. Is there a way to do it???

PS: Asked this question on the "Official Titan Upgrading Thread, http://forum.ppcgeeks.com/showthread.php?t=33857&page=45" but I don't seem to be getting any answers.