What hardware do I need to Flash

[drewmerc]

good a 5101 simply you need a jtag cable

now if your computer has a parallel port i'd suggest building a simple jtag cable http://www.haxorware.com/forums/thread-24.html it's cheap, easily built (you can skip the resistors just keep the cable under 6") but very slow (if your only doing 1 modem it wont matter)
if you have no parallel port there's the blackcat usb around $30 many people have issues with these (but i think thats because they dont read the manual) and the hardware is not very good
you could always get a usbjtag NT at $60 there perfect device for modems but over kill if only doing one

once you know have a jtag cable (and tell me the type) we move on to the next step (dumping and flashing the modem)