FIG. 1 is a front right top perspective view of a cover for connecting terminal of electronic device showing our new design;

FIG. 2 is a rear left top perspective view thereof;

FIG. 3 is a left bottom perspective view thereof;

FIG. 4 is a front left bottom perspective view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a left side elevational view thereof;

FIG. 8 is a right side elevational view thereof;

FIG. 9 is a top plan view thereof; and,

FIG. 10 is a bottom plan view thereof.

The broken lines illustrate unclaimed portions of the cover for connecting terminal of electronic device and form no part of the claimed design. The dot-dash broken lines define but are not included in, the boundaries of the claimed design.