STOS, the original STOS works only with older TOS versions, up to 1.04. But there are diverse STOS fixers which make it work with higher versions, so with 2,06 too. Use search on forum, and will find plenty of threads and links about.
Best is to upgrade machine with switchable TOS, so you can have both - 1.62 and 2.06. That's been discussed too a lot.
Negative feedback has usually positive effect.