Lack of documentation. Is it possible to change chip frequency 32-16-8 MHz?

[agusevtec]

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[agusevtec]

How Is it possible to change chip frequency 32-16-8 MHz?

[nulllaborg]

DIY Mode you can chioce

[blazej222]

DIY Mode you can chioce

Sorry, could you elaborate on that? Is it possible to change the frequency without changing the code of my program?
I have a .hex file compiled for original arduino nano, but it doesn't work on this one because the frequency is set to 4MHz instead of 16MHz. I don't have the source code anymore, and would not like to disassemble the .hex just to add a few instructions changing CLKPR register.