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Technically possible but not practical. You would need to open the unit, physically desolder the surface mount rom and install a rev R rom. I leave it you to figure out how to source the version R part...
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The 48G was made before modern "flash" was even an idea.
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Quote:
Hi there. I am trying to find out whether you can update a ROM version in a 48g. I have one with version K and I want to know if I can put version R on it.
Like many others already told you, I have to say that the ROM content can't be changed easly. But a HP48 with ROM revision K is more or less a collectors item (also depends on the condition). You should try to find somebody close by you who's willing to exchange your one by a R version. IMHO from collectors aspect a HP48 with ROM revision K is much more worth than the more common R revision, when both are in good condition.
Cheers
Christoph