The ornamental design for an electronicdevicecover, as shown and described.
FIG. 1 is a top view of a first embodiment of the electronic device cover featuring my new design; and,
FIG. 2 is a top view of a second embodiment of the electronic device cover.
The oblique shade lines in the drawings depict a surface that is reflective. The broken lines within the circular solid line features, the broken line curves forming the corners, and the broken lines and areas immediately surrounding the solid line perimeter of the article depict portions of the electronic device cover that form no part of the claimed design.