Delta "AC Mini" on 1.6j not working

[ceskaiser]

Hello,

I have this charger with a manufacturing date of 2016. Exact model is EVMU3017MWSEL. No matter what I try, it only works on OCPP 1.5s and I'd like to have it working for 1.6j as I want to be able to control the amount of current is delivered per session and possibly balance charge between two similar units.

It would look like the firmware version is v01.02.30.03.220, I've seen the version tested is much higher than this.

I contacted Delta Electronics and they've told me this unit is no longer supported and they cannot provide the latest firmware. Wondering if:
1- The unit was never meant to work on 1.6j or,
2- I need a newer firmware. If yes, would someone in this forum still have a copy and share? Or,
3- Is there a way to limit current with OCPP 1.5s?

Either of the above will be great.

Thanks,