Nec Nd-1300a

Hi guys

Please bear with me as I am completley new to this game.

I have purchased a NEC ND1300A OEM Version and is currently on Firmware 1.05, I am looking to upgrade this to a later version so I have a greater choice of media, but I believe I can not use 1.08

My problem is that I have never updated firmware before and can see that people in the past have had problems, can anybody please give me an idiots guide with links on how to do this.

Thanks in advance
Simon