MultiPlus, cannot do remote firmware updates, but configuration is possible using Remote VE,Configure (at the bottom of the Devices page on VRM).
MPPT and BMV (VE.Direct devices) can do remote firmware updates via VRM.
On VRM, select the devices page and at the bottom will be the option for "Firmware Update"
Make sure that Two Way Communication with VRM is enabled on the Venus GX.
So it's only possible to firmware update the MultiPlus via the Interface MK3-USB (VE.Bus to USB) - ASS030140000?
Yes, currently that is the only way. Using the MK3-USB adapter and VE.Flash software (part of the VE.Configure suite).
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