From Aeonlabs support i got the following answer:
Although that might be partly true, its a fact that they come with different firmware. Since the seems to behave slightly different i want to upgrade them to the latest firmware."To my current knowledge, there is no firmware update for the Smart Switch Gen5 or the Z-Stick Gen5 as of current, they should all come fully updated."
I thought Aeonlabs support was the way to go but it seems to be a dead end. Anyone have a clue or have a name at Aeonlabs to contact?