This may not be all that helpful, but if your willing to learn (and possibly fry your controller) you may have a makerspace near where you live. If so, they would most likely have a soldering setup that you could use for a small fee.
Or heck, my local Library has a tool checkout system. Check with your local library (the bigger the better) as there’s a non-zero chance that they could loan you one.
About that… Palantir was founded by Peter Thiel, and they are working hard to be the primary software vendor for the government. So you may not be able to avoid Thiel owned business 😭.
The gall
Damn dirty communist out here demanding
Checks notes
Affordable living and healthcare
Just despicable!
Taco Don: I want to use tariffs to hurt enemies of the USA
USA legislature: makes a bill to hurt Russian Interests
Taco Don: No Not like that!
This may be a dumb question, but any idea why you would want/need to update the firmware of these controllers?