Welcome to Justanswer.com, my name is ***** ***** I will do my best to assist you.
I dont feel confident about the " low voltage" advice you were given. The standard way to update printers is via a USB cable. Ive recommended and overseen hundreds, if not closer to a thousand different printer software updates using a usb cable. The printer you have though, cant have its firmware update as there isnt any firmware updates showing on the samsung support page.
There are a ton of drivers, and even a easy wifi utility that may help. But not the type of firmware the samsung reps were suggesting.
An easy step may be, going into the admin control panel of your new wifi router, and then setting the network name, and the password ***** the exact ones that the printer was using before. That should let the printer reconnect.
Or, you could try downloading and running the easy wifi setup utility, and seeing if it can guide you through reconnecting to the network.
The main issue here is, the printer still has the old network name and password ***** So we need to either go into the printers control panel, settings, network / wireless and connect it to the new network. Or we need to use the wifi setup utility.
If you get stuck or run into issues attempting the above suggestions, let me know.
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Senior Technician and Network Switching Systems Operator / Maintainer.