The Lcd Does Not Come On - HIMS Braille Sense U2 User Manual

press the reset button, or press "1-2-3-4-5-6-F2-F3." Do NOT hold the
reset button for more than 5 seconds.

22.10 The LCD Does Not Come On

If the LCD screen does not come on, make sure that it is turned on.
Press "space-o (dots 1-3-5)." Then, press "F3-F4" twice. Press "space"
to turn the LCD screen option on, and then press "enter" to save the
option.