The very same situation happened to me, too.
I upgraded from A100 to A103. It took a very long time - about 30 minutes. And in the end I received the same message.
The interesting part is, that after rebooting the firmware version is recognized as A103!
Should I give a try with A102 maybe?.....
I tried Nero for writing - do you have any clue, why is "Simulation" disabled?? I use v184.108.40.206 - I know it's quite old - could this be a reason?......