Downgrade DB from 2020.2 to 4X for Docker

[Sopalin]

Hey guys,

As many noticed, the linuxserver docker images is not up to date. I'm currently thinking to move all my environnement in docker. Homebridge & MyDomoAtHome works like a charm in my test environnement but i have an issue with Domoticz.
Linuxserver image provide domoticz in 4.X version and my current environnement is in 2020.2. I try to import my current DB in docker but it's doesn't work.
Do you know a process to downgrade the DB or export/import object from new to old DB ? I really don't want to recofnigure everything when i have everything setup correctly.

Thanks.