Update Wp76XX 18.5.1


Hello I have one issue
How can i update legato version 18.5.1 ?


Have you tried the Getting started guide instructions?


I have tried with develoment studio but i can not get any update in develoment studio for 18.05.1.
if you have any instructions, command or repo link for update legato 18.05.1. please share with me.
Kindly help me.