Hi,
Finally I solved with piotr help.
I played with SD and found that after deleting 2577 and autorun.exe from SD the problem apear.
I just made on SD folder 2577 and place a dummy autorun.exe and TT 6.20 work again.
thank you piotr.
L.
p.s.
Interesting that with TT 6.20 7130 if I check for upgrade with TomTom Plus it found valid upgrade 6.01 build 7720
Finally I solved with piotr help.
I played with SD and found that after deleting 2577 and autorun.exe from SD the problem apear.
I just made on SD folder 2577 and place a dummy autorun.exe and TT 6.20 work again.
thank you piotr.
L.
p.s.
Interesting that with TT 6.20 7130 if I check for upgrade with TomTom Plus it found valid upgrade 6.01 build 7720