A button sequence shared in the Leica community opens a diagnostic service menu on the M10 and M11. The menu does not appear in Leica's documentation or the M11 manual reviewed for the report.
To open it, briefly release and press Play again, then press Up, Left, Down, Right and Up, and release the controls. The pattern resembles the Konami code used in games.
The report says the diagnostic test may enable only limited touch detection, not the full touch function Leica built into the M10-P. No Leica statement was found, and nothing in the evidence shows that a firmware update will unlock touch on the M10.
This is a menu access trick rather than a firmware change, and the report does not describe any risks or warranty effects. Treat diagnostic menus as Leica's internal tools and avoid changing options you do not recognise.