I too am afraid to take mine to a so called authorized service center to have the update installed. I’ve spoke to two different serice centers and they say I would be the first to have one done. Just sayin’ I don’t wanna be their first experiment.
The only issue I have so far with my Xi5 is that sometimes it doesn’t stay on the anchor waypoint. This is also my second lower unit due to water intrusion so needless to say I’m not happy with it. If you buy one, be sure and purchase the extended warranty through Mercury.