Please help me Flash and Unlock a Samsung A800

Ive got a samsung a800 and its locked to orange and i want to use it on o2. I tried a code of the internet and now it just flashes on and off three times and then leaves a thick black box on the screen. I ve heard that you can reflash the phone and unock it with a cable and the correct software. Ive got the cable and i just need to know what software i need and a guide to using it.

so you bought a cable not knowing what the hell to do with it?

onewecallgod said:

so you bought a cable not knowing what the hell to do with it?

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Ive been search other forum sites and they said that they had no problem flashing there a800 with this cable with software called easylink. Ive tried easylink but it doesnt work. Im wanting to know what other software there is i could use to flassh and unlock my phone.