redefine (physical) constants

[Lukas]

I noticed that some of the physical constants that one has access to on the HP Prime are ever so slightly off. Or to be more precise we in the meantime have more exact values for some of them and that isn't yet taken into account by the HP Prime (even with the most recent update).

Take for example the Stefan-Boltzmann constant sigma. It's value (without units) is
5.670 374 419*10^-8
according to what we currently know [1]. According to the HP Prime its value is however
5.670 367*10^-8

So I was wondering if I could somehow redefine these physical constants on my own HP Prime. If so, how? I'm aware of the possibility of adding user defined constants, but that's not what I'm looking for here.

Thinking more long-term I also wonder where and how I could report the underlying issue. Because then I would go through all the constants available on the HP Prime and compile a list of what should be updated and with what values.

[1] https://physics.nist.gov/cgi-bin/cuu/Value?sigma