DOS2 - Impressions?

[lilililililililililililil]

Hey how do I update from 2.81 to 2.85?
I just bought used speaker and it’s on firmware 2.81 once my is on 2.85


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 You need to send an Help request to the Devialet CS thorough the Devialet App. You should report the issues and and ask to have both your products upgraded to 2.8.5 firmware. They will “push” the upgrade to your system after checking your serial numbers. Generally this is dove with a few email exchange with the CS that moves then your request to the technical team.

Any ideas as to why this is so?
I have same issue, 2.8.0(preinstalled) and 2.8.5(updated from dos1)

I can see units have wifi chips by different manufacturers. Wondering if I should get the shop to give me 'near by' serials.