Please try tap and hold screen for a while, like when you try change watchface.
Cool idea, thanks. I tried it right away, but unfortunately nothing happens.
The only thing the band responds to is touch, then the display turns on and the blue logo appears.
I've also tried swiping or repeatedly plugging and unplugging the charging cable, nothing helps.
But as I said, the band counts steps and, for example, if you select the "Find my Phone" function in the ZeppLife app, the band vibrates. Nevertheless, this logo is permanent. If you unpair it then the pairing QR code appears and you can pair it again. After that the blue logo appears again.