Yes you can update from v1.0 to v1.3 directly.
I would advise to update to 1.30 even if you didn't noticed anything wrong, because there were a lot of bugfixes between 1.0 and 1.30 …
I recall having seen something about corrupt registration memory... and I personally encountered a 'stuck notes' bug a few times with the v1.02 firmware...
But even with a 1.30 firmware, there's still many bugs (though mostly unnoticed by a
lot of people , since we all use different features of the same arranger
).
Be aware that between v 1.02 (my Genos was a 1.02 when bought) and v1.10 , they strangely removed a very useful feature concerning DSP Parameters (you'll notice it if you assign multiple DSPs on the same channel , in v1.02 there were a 'bolt' button near each assigned DSP, but it was removed starting from the 1.10 firmware ...
Workaround exists, but it is still
only workaround.... )