98% people still not know how to into Hex mode on thermal printer H58:
Press feed button and power on, keep press feed button untill you see the erro light on-off-on-off, release your hand, then you go to Hex mode. By this mode, usually for printer engineer to detect how is the printing code. Only for R&D use or the detecting using. After pressing feed buttom for 3 times, it will come to normal mode.
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