According to Imaging Resource, Pentax has confirmed the “hot pixel” problem in Pentax K20D DSLR and assured that the firmware update to solve this issue is on the way:
Pentax USA has confirmed the issue, themselves noting that it only seems to occur when the 2-second self-timer is employed. They said that the engineering team was working on a firmware fix for the problem, and that a fix would be publicly available at some point in the future. No ETA was available for the fix yet, as the engineering team had apparently only just recently confirmed the problem and its cause.
DPReview forum user Pfan has contacted Pentax European Headquarter chief technician and reported that…
Since yesterday evening there is a firmware-fix ready and we implemented it on my K20D – IT WORKS !
This update will be implemented in the next firmware version – it will be available after quality testing phase in the near future.
So they worked fast and fixed it – it´s NOT a hardware question – and everybody can update the K20D´s via normal sd card update process.