Want to figure out the issue - Can’t access BIOS after CPU upgrade?
Lets check it out.
Cant Get into BIOS After Upgrading CPU
Why is this inaccessible problem happening?

How to Fix Cant Access BIOS Setup?
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Fix 1. tune up your BIOS
Step 1.
Check your computers model name or the motherboard model.
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Browse your machine manufacturers official website and download the latest BIOS version.
If youre not tech-savvy, youd better refer to this link toupdate BIOS.
Transfer the BIOS update file to a blank USB drive, since you cant access BIOS after CPU upgrade.
After the update process finishes, your machine will automatically restart with the new BIOS firmware version.
Fix 2.
Re-enter BIOS/UEFI
You should try toget into the BIOS settingsagain with the following steps.
PressWin + Ihotkeys to evokeSettings.
SelectUpdate & Security> click onRecovery> hit theRestart nowbutton underAdvanced startup.
ChooseTroubleshoot > Advanced options > UEFI Firmware controls > Restart.
Then the system will restart and enter BIOS/UEFI.
Fix 3.
Removing CMOS battery and putting it back in is worth a go.
Power off your gear and remove all peripheral devices and power connections.
Step 2. kick off the computer cover and take off the battery for 1-5 minutes.
Then reconnect it to the computer and put the cover back on.
Reboot your machine and verify if you still cant access BIOS setup.
How to clear CMOS to reset BIOS tweaks?
This post shows you 2 ways to clear CMOS.
Fix 4.
Update Windows
Step 1.
Click onStarticon and chooseSettings.
Go toUpdate & Security > Windows Update > Check for updates.
It will start to search for, download, and install any available or pending updates.
In this case, its a good idea to find out if the power cord is loose.
Purchase an equal CPU: The new CPU is too new for your gear motherboard.
You should purchase an older CPU or buy a new motherboard to make it work.
Wrapping Things Up
c’mon feel free to use these solutions in this guide.
I hope they can help you solve the cant access BIOS after CPU upgrade problem.