Hi, In the "How to update DP800.pdf" , I did not understand the point 7 and 8.
The manual says:
"..........and press M4?M2?M1 button"
I have to press these keys together, or one at a time (one I press M4 and release M4 and , I press M2 and release M2 and , I press M1 and release M1) in sequence ?