Danfoss are quoted as naming two systems, AK-SM800 and AK-SC355.

AK-SM800 looks like a current product. Danfoss have a PDF dated 2026.06 about it: https://assets.danfoss.com/documents/latest/590332/BC3376298.... This mentions "All new Electronics platform supporting new Operating System (based on Linux)", and specifically advises against connecting it to the internet.. Reading between the lines, especially section 10.5, it sounds like there was a major security revamp in 'release 4.0'. The article mentions "outdated firmware", so perhaps that refers to things before 4.0.

AK-SC355 looks like a product from 2010 (that's the date in the PDF metadata, plus the examples in the manual mention 2009). https://3.imimg.com/data3/ID/LC/MY-3170595/danfoss-system-ma...

I haven't worked with supermarket control systems, so I only know what I've read in the PDFs, but it looks like this is not about throwing out entire fridges to update the control system. If you have the newer AK-SM800, it looks like the suggested action is to update firmware and follow instructions about keeping it well away from internet access. If you have the older AK-SC355, then keeping it away from the internet is even more important. Or, update to AK-SC355.