Brother TD-2120N - Manual (Page 85)

Updating P-touch Editor (all models) / Updating the Firmware (TD-2020/2120N/2130N only)
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9
f
Check the content to be updated, and then click [Start] to begin the update.
g
This screen is displayed on your computer while the software is being updated.
NOTE
Do not turn off the machine during the update process.
h
Click [OK] to complete the update.