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Keep the USB cable unplugged until the driver setup prompts you.
Most users should select USB001 (or the highest numbered USB port available). Calibration: easypos+lp420t+driver+download+high+quality+link
Summary
Depending on the specific emulation your printer is using (EPL, ZPL, or TSPL), you should select the corresponding driver: Keep the USB cable unplugged until the driver
: Choose the correct link above from BarTender's official driver page . easypos+lp420t+driver+download+high+quality+link