Head rank is B, Temperature (I think T is temperature) is ok, Voltage isn't ok (it doesn't like my 9V power supply and puts an X here but it seems to work just fine).
Apparently, you can set the country code.
The key word (I think it's letter U) lets you put in a 3 character code like a password, but no matter what I type it doesn't seem to do anything. In fact, to exit this I have to turn the unit off.
S will check the sram.
Since we've got USB, we have a USB IC check on letter A.
And if you plug in the USB port to a computer, the USB VBUS will display "ON" instead of "OFF". I think it's letter V that does this check.
I discovered that it won't enter info mode if there is any text entered or any styles set (like style=bold, style must be normal).
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