After 1+ hour of "upgrade" I stuck first on Restoring MCU/Bootloader,after 20 min I close Ledger Manager and disconnect Ledger.Then I move to Update screen,but nothing on LM.There seems to be a problem with Ledger drivers,so if you are on Windows go to Control Panel\System and Security\System >Device manager and under Human Interface Devices - USB Input Device check for any device with yellow mark/click on remove.Then open Ledger Manager and connect Ledger,you should see processing on Ledger screen and for me it was finished in 2-3 minutes.
Thank you so much for this post. I though my ledger nano was broken or something and I emailed support but then I came here, tried what you did and the problem is solved now.
Much faster that Ledger support.
You're welcome,I was in same situation like you and I was thinking that I brick my Ledger at one point.But fortunately there were some users who had the same problems so I found the solution.It is obvious that the process of firmware upgrade did not go smoothly for most of users-but it was mostly dependent on an individual user and his OS,device or Ledger servers at some point.
I also must say that based on my experience Ledger support is not of some help,in fact all that can interest the user is available on their site,so before contact them it is better to check their knowledge base.