Hi,
when you buy the UnO2 chip you always get the latest version, which is v.1.2 - I have updated the text on the website, which was not kept up to date. (the UnO2 change log mentions v.1.3 as "work in progress", which means it has not been released yet. No idea when it will get released - if ever)
For updating the firmware you will always need to buy a new chip, which will not be free. I planned to provide bugfix releases at reduced price, but there have not been blocking issues which required such release (except for a bugfix release of the editor software, which was free)
regards,
Xavier