You have to turn console on, connect to internet, enter the right DNS to block PlayStation Vue from updating and you can load Hen back onto it in seconds. Check video.
It stays on there as long as PS4 is in rest mode. If it completely is turned off you have to reload through Vue again. There’s alternate ways to do it but i have the Vue method on mine. But you have options.
USB stick has a back up of PS4 just in case anything happens, you’ll have a backup to restore.