wow this is embarrassing sorry i didn't know that as you can see i just signed in , and thanks for xebuild and simple 360 nand flasher it is really some good stuff
and i'm not talking about the 17489 but flashing the corona 4gb in general cause xeBuild dosen't support corona 4gb (can't determine nand size)and eve if we force it to it will screw your dvd driver
and i found the latest version (17489) in some tutorials and i managed to get it work properly (i have no problems too)
but stil waiting 4 the dashlaunch (do you have any idea when it gonna be realeased )
and the xbox live thing you didn't say anything about it
cheers