Bad BIOS checksum error! | CMOS checksum bad: default configuration used| How to solve it!?? [Hindi] - YouTube
CMOS Checksum Bad - Quick Easy Fix 1 - YouTube
Lenovo手提電腦維修]Lenovo X1 Carbon 開機顯示0251:System CMOS Checksum bad-Default configuration used. Real Time Clock Error-Check Date and Time settings Press Esc to continue or F1 to enter Setup.