vivomove hr can't show any info, paring code is missing

My vivomove hr can't show any digits, the display doesn't work. And worse, I tried to connect it with Garmin Conect app in new mobile, I can't see pairing code from the watch. usually it is 6-digti numbers. How to solve the problem?  Can I find the 6-digits numbers from SDK?  If yes, which file it is in?