Hello.
You can upgrade Maxisys to Maxisys Pro by purchasing a Maxiflash Pro.
A Maxiflash Pro can only be paired with only one Maxisys. So to upgrade Maxisys to Maxisys Pro, Maxiflash Pro should be a new one and never be registered or paired before. In addition, when upgrading Maxisys to Maxisys Pro,Maxisys should have the latest system version.
PS: Maxisys Mini cannot be upgraded to Maxisys Pro with Maxiflash Pro.