Question Clear CMOS & reinstall Bios (Flash) confused

[ericfah]

I been overclocking a lot, getting whole bunch of errors. So if wanna make sure everything is intact or fully functional after those errors, meaning getting a relevantly “clean bios”, do I just flash the bios again or just do a cmos clear? Which one is more clean or let’s say more thorough. More wipe out everything type? Or either one is okay?
My board is Apex Z890, CMOs is a button on the rear panel.
Also, I always not sure what’s the best way to use this CMOs, so I cut the power completely (switch off the PSU) or just shut down the PC is fine? (While all the lights still glowing in my case)

Thanks u!

 

[BFG-9000]

BIOS is saved in nonvolatile flash memory while CMOS settings are stored in very low-power RAM which is why the battery is required to retain settings--it has to be periodically refreshed. They are two different things in two different places