I think many people have asked this question and it has never been properly answered.
I dont think its possible to do this and I was baffled when i found this out (the fx-991es does it!)
It is miraculous if the new version does it.
There is a new 'Simplify' option in the menu, but im not sure of its use
Regards
Yeah for that reason I use my 991 for trig and stuff

the manual doesnt really give much info on the Simplify option either (unless i'm missing something)
oh, so there IS a possibilityMarketing...
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However, for a future OS 2.01 update, it should be possible to just "crack" the update application and to remove the model type check entirely.
But currently, the only way would be to read out/make a copy of the fx-9860GII (SD)'s flash memory and to reflash the fx-9860G (SD) with it.
This, however, would require some homebrew communication application to be written and xfer9860 doesn't have the desired functionality yet.

But wouldnt the 9860G **** itself over the backlight option?