I don't have an Inkpad 3, but those are the correct instructions for my Inkpad 1 and every other PocketBook device I own. You can always go to their website and download the user manual for your model if you want to be 100% sure. However, the v4.4 firmware is an old version for the Inkpad 1. You need the latest for the Inkpad 3 (v5.19). See here:
https://www.pocketbook-int.com/us/su...tbook-inkpad-3