As Trux recommended, I tried to remove product and deleted second account, then made Factory reset on watch, removed all instances (product - not retired but deleted) of watch in garmin connect and express and it worked until I tried to connect it to PC by cable. It uploaded steps, HR and weight and freezed steps again. In GExpres it synchronized really long time, probably endless, and when I clicked on Sync (where software version is visible and wrote me, I am up to date), I went back and there was green tick, that its finished. Then clicked Eject Garmin in Explorer an after that it was surely freezed.
I dont have mobile compatible with Garmin app right now so its only Watch vivoactine3, Garmin express and garmin connect. Nothing more is in the game and its still kinda broken. :(