Flashwizard is still not running with 7020's. Only for 7000's. FWP is Flash Wizard Pro. They also have 5.2 version.. But still not functioning with 7020's. So you can install the 7020 image by using the internet browser.. The cable is RJ45.. If it is directly connected to your PC take the Cross RJ45. But if you have a router connected in between than it is RJ45 normal cable--or straight.However you call it..
Flash wizard doesn't work with 7020s, it doesn't support the nfi file format, annoying considering there was new release recently. To do a USB flash, I think you gotta use miniroot, but I would advise against it. Its a little tricky, I haven't done it though. My suggestion is to hold out for flash wizard.