As recmmended it's very important to save youre settings, wpts etc... before doing an update and it's also recommended to execute a hard reset once the update is perform (Team Colibri insist on this and he is right)
What you need to follow the instructions are: a smartphone or tablet, the Link app already install on youre mobile, and a Lowrance or Simrad unit with the wifi integrated
Excuse my accent but it's not easy doing thise and talking to myself at the same time