What is the complete process for update an AMD Athlon(tm) II X2 Duo 260 3.20 Ghz Proccesor pc bios?
Need to post your computer setup such as Make & Model of Motherboard, BIOS Version installed, Windows version installed, GPU, CPU , etc etc.
If you are asking how to update your Motherboard's BIOS version to a later version, you need to go to your motherboard's Manual which should guide you on how to update the BIOS.
The CPU processors doesn't need anything updated unless you are asking about replacing the CPU with a more modern CPU. In that case, Need to know exact Make & Model of Motherboard and BIOS version you have installed.
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