CMOS checksum invalid 502 error

[kartikn1v]

i  recently encountered cmos Checksum error 502 , i recovered BIOS using flash drive but the problem is still persistent 

i already changed the battery 1 month ago.

when i turn on the laptop it will show error with restart then after it'll just shutdown doesn't even turn on ,then again after many tries it'll open. 

every time it's the same story when i start the laptop in the morning.

if you have any suggestion Please help me...... 

[BeemerBiker]

1. Turn off the computer.
2. Press and hold the Windows and the V keys.
3. While still pressing those keys, press and hold down the Power button on the computer for 2-3 seconds.
4. Release all the keys.
5. At the completion of a successful CMOS reset, a message showing CMOS Reset (502) will be displayed.
6. Restart the computer.
7. Press F10 to get in to bios. Check Date and time.
8. Press F9 to set bios defaults. Ensure secure boot is enabled.
9. save setting when you exit