Brother TD-2120N - Manual (Page 48)

How to use P-touch Transfer Manager & P-touch Library
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5
d
Choose Load Firmware function of the BRAdmin Professional.
Choose [TFTP PUT] and click [OK] button.
e Choose the file in .blf format which you saved in step b and load it to the printer.
Choose .blf file and click [OK] button.
NOTE
With TD-4100N, the default password is “access”.