Entering the service tag in the bios, See "entering the service tag in the bios" on – Dell Inspiron 13z (N311z, Mid 2011) User Manual
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System Board
Entering the Service Tag in the BIOS
1 Ensure that the AC adapter is plugged in and that the main battery is
installed properly.
2 Turn on the computer.
3 Press <F2> during POST to enter the system setup program.
4 Navigate to the Security tab and enter the service tag in the Set Service
Tag field.
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