I have a 1213S@1653S with firmware CS0T. It’s had that firmware for months.
I used to be able to burn very cleanly with a stack of RiDATA DVD-Rs (see attached). But I burned a disk last night, from the same batch, that produced a terrible KProbe scan (see attached). I tried burning a couple more, with the same batch of disks, and the scans are equally rotten.
What could have caused such a degradation in the quality of the burn with the same batch of disks, with the same firmware?