Can we please stop wasting $$$ on pointless efforts.
Only a high yield nuclear warhead detonated high in the atmosphere would generate a large enough EMP to do sizeable damage.
If that happened, we are in WWIII so we might as well save the 1T$ it would cost to upgrade.
Ever heard of a “Cornonal Mass Ejection?” The Carrington Event in 1859 was caused by one. Telegraphs across Europe and the US failed, many of them delivering shocks to their operators.
https://en.wikipedia.org/wiki/Carrington_Event
The same thing today would probably wipe most electronic technology from the face of the planet.