Homebrew rxTools: Changing firmware versions

[Myria]

What would be required to get rxTools to work on different firmware versions?

When I look at the rxTools source code, there is stuff like this:

#ifdef PLATFORM_KTR
blx 0x08062890
#else
blx 0x08062A28
#endif

These seem like addresses in Process9, but I don't know which firmware version. I would assume 9.5 for New 3DS ("PLATFORM_KTR"), and 10.0 for Old 3DS, but there's no indication of this anywhere. Where does 0x08062A28 come from, and how could I get the value for an older firmware?

And yet, rxTools works across several firmware versions without trouble, which puzzles me. How does that work? >.<

 

[Exavold]

NEVERMIND , SOMEONE DELETE THIS.

 

[Myria]

What do you mean by "different firmware versions" ?
You are scaring me.

I want to try using rxTools to load firmware.bin of older 3DS versions to make an EmuNAND on them.