Amateur hour. They didn't capture or eliminate Erdogan in the first place. Then they failed to cut off internet and television within the country, so Erdogan was able to rally his supporters to the streets, and the soldiers were obviously (and rightfully) not willing to mow down mobs of civilians.

If you ever hoped to see Erdogan removed from power, this is the worst possible outcome. He will now use this as a pretext to solidify his strangehold on civil society, carry out a purge of disloyal elements of the army, and do whatever else he must to solidify his place as dictator for life.