Where Can I find OS.bin of CASIO PRIZM fx-cg20?

[SuperXX]

I just want to know if it´s possible to backup the OS.bin to use it later flash an OS into my CASIO Calculator using fxremote if something wrong happens.

[critor]

Unfortunately, fxRemote last update was in 2012.
fxRemote isn't compatible with the fx-CG10/20/50.

If something wrong happens with the OS, you can still use the Casio updaters to reinstall a working OS.

[SuperXX]

Oh, that´s a shame. Thank You anyway