I have a Ricoh Dvd+Rw Mp5240A . The Manual says to use 4x media- I have great success with Tdk media 4x. I went to store to buy some Tdk 4x- All I can find are 8x all of the sudden- I buy -open the package and it says donot use with a 4x writer inless you update firmware. I find the site to update but do not understand the directions. Will these 8x work on my Ricoh ? Is it absolutely necessary that I update firmware and if so can you explain to me how you do this ? Thanks very much for any help anyone can give me.