SNBC BTP-L580IIC User Manual page 19

2) Insert the U-Disk into the USB interface of printer;
3) After opening the top cover, press the FEED button while powering on the printer;
4) Release the button immediately when the error LED is on. The time of pressing the button
after powering on the printer should be controlled within two seconds; otherwise it will be
disabled;
5) When entering printer update mode via U-Disk with error LED flashing continuously, do not
operate or power off the printer;
6) Printer update via U-Disk is complete when error LED stops flashing.
7) Finally, remove the U-Disk from the printer.
8) If printer enters into the mode of update via U-Disk without inserting the U-Disk, it will wait
for U-Disk to be inserted and not respond to commands or button operation, and it will
update normally if insert the U-Disk at this time. To exit from the update mode, printer
needs to be restarted.
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BTP-L580IIC User's Manual