EMP, EM - Not in this case.
EMP or EM has been mooted a couple of times as a possible cause of electronics failure in this incident.
That didn't happen. Aircraft operate in nasty EM environments as a matter of course. On the ground, they are exposed to nearby in-band transmitters (aviation frequencies). They are also exposed to high power microwave from ATC and ground control radars, and various other radio transmitters from ATC to cell phones to public safety and ground handling radios. In the air, they fly through thunderstorms and are hit by lightning quite frequently. Lightning is an extremely high power EMP source, with characteristics similar to a couple of components of nuclear HEMP (the "EMP" threat one reads about).
This means that aircraft electronics are well protected against EM and EMP threats (although nuclear-generated HEMP *might* damage some systems). Short of nuclear weapons or lightning, getting high powered damaging EM or EMP into an aircraft in cruise altitude flight is virtually impossible. I don't believe there were thunderstorms on the known flight path, and even if they were present, it would be very unlikely they could have caused this particular set of events.
EM/EMP/ESD did not take down this aircraft.