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Thanks for keeping alive the conversation.
simultaneously instead of just clicking "OK" for the code to be accepted. Clear the Password : Once unlocked, navigate to Security > Admin Password
: This clears configuration settings (like boot order) but rarely removes a supervisor password on newer Dell Enterprise laptops. How to Reset Your Dell BIOS or CMOS & Clear NVRAM
To help narrow down the best solution for your machine, let me know:
Are you currently seeing a on your screen after failed password attempts? How to Reset, Remove, or Recover BIOS Passwords | Dell US
