S12 Keyboard lock/unlock
I copied the French manual into Babelfish and did a translation and it looks like you simply keep your finger on the [V/L] key for more than 2 seconds ...
"To avoid any accidental change of channel, to press key [ V/L ] during 2 seconds to block the keyboard. Keys [ ON/OFF ] and [ SD ] (lighting), will remain active. To press another time on key [ V/L ] during 2 seconds to free the keyboard."
Hope this helps ...
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