dongle cobra

hello boys

i got problem whit install the cobra dongle.

i got 2 ps3 firmware 4.25 and 4.31.
i buy cobra dongle and i have install it.
1.install devicle on my pc for cobra dongle is oke.
2.update from the dongle to 6.0v.cba its done.
3.downloading the cfw 4.30 and undzip it on desktop.
4.make folder in usb ps3/update and copy at here.
5.plugin cobra dongle on pc stand and plug in usb whit firmware.

now step on step i read this from cobra.com *site*.
when i want the install this on systeem update and choise from usb devicle.
it wil be start but on 77% its give my a error mesaj :questionmark:currepted file. and a number.

so what i do wrong?
i have buy from hong kong this stuf but it wil not work.

please help my :questionmark::questionmark: