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Echo is a daemon which reboots and recaptures a random hacked mainframe device.
Echo can target most hacked devices, but some devices — Augment Grafters, Augment Drills, all drones, and the Security Hub and Mainframe Lock — are specifically exempt. If Echo has no valid targets, then it has no effect.
Echo is a relatively weak daemon; if it reboots an important device like a Security Camera in a room you need to go through, then all you need to do is hack that device again. On the other hand, Echo often targets a device you don't need to hack:
When Echo is triggered by hacking a device, that device itself may be the one rebooted by Echo.