Hi Carlos,
I don`t have ver.1.20 , I have ver. 1.03 as main boot and ver. 1.10 as main program.
The only person in this forum that I know of the has ver.1.20 is "Linda Fus", she may be able to help you.
Best of luck with your PSR2000 and if your happy with it and it works "ok" for your needs, I would say just "hang-on-to-it" until or if you start having problems and then mention the up-grade at that time. You got the "Survial-Kit" 2 year warranty I hope! If I can help, feel free to contact me or ask for help on the forum there are many people here that have the 2000!!
jedi