I followed your procedure:
I started Nuvi ,pressed sat bars icon to get Satellites page, once I got the best accuracy I pressed Heigh , in this new page I checked Predicted EPH and cold start.
From this page I shut down my Nuvi off holding off button.
I restarted Nuvi and after restart as soon as I reached main Nuvi page satellites bars were immediatly green.

Getting Satellites signal now is immediate even indoor, may be I get bad satellite accuracy,for example from my living room sofa I get 50 mts,but I get it. This never happened before.

I cant say if it changed my Nuvi sat accuracy, but It changed the speed and satellites signal reception for sure.