HL7810 firmware update

As far as I understand sft does not work with HL7810… Can these oneclick-things run on a arm-based Linux platform?
Are delta-updates possible with HL7810, and if so, where do we find delta-archives?

Does this help to use local firmware download?

Yeah I saw this one:

1.3.4. Local Delta Firmware Upgrade Package (applicable to all modules)

But where to download these packages, not here what I can see?

Did you contact distributor to get the delta package for local download?