Acer AC4B SM50 KB.I140A.015 用户手册

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Chapter 2

To clear the User or Supervisor passwords, open the RAM door and use a metal instrument to short the 
RTC_RST jumper as shown below.

To clean the User or Supervisor passwords, perform the following steps:

From a DOS prompt, execute clnpwd.exe

Press 1 or 2 to clean the desired password shown on the screen.

The onscreen message determines whether the function is successful or not.