Hi and welcome!
Try the following: Format (erase) the disc prior to writing something on them. If Nero fails, then try other apps like ImgBurn.
Also you can write to "Image Recorder" in Nero and burn the so created Image file with ImgBurn.
You can try other media (like Verbatim), too.
I won't recommend updating the firmware, as MYR4 has some negative points in respect to writing CD-R media