I have got a used xbox 360 premium flashed with the latest ixtreme firmware. It includes all the accesserios which comes with the system like hard drive, wireless controller etc.. It is working on xbox live and not banned.
I bought this console about 3 months ago and the only reason i am selling it because i have ordered new xbox 360 elite. As you know the warranty is voided on this system but it is in fully working condition. I am in barking,London. you are welcome to pick up the console or i will post it using the method of your choice.