Dead ruuvitag?

Hi, My ruuvitag has stopped working.
I changed the battery to a new one (checked battery with a multimeter to, just above 3v) But it is not starting/led is not blinking. The tag looks clean and have no visible damage. What can I do?

Hello, you can try to enter bootloader with these instructions: If it works, you can install FW version 2.5.9.

If bootloader doesn’t work either, please contact and we’ll check if it’s covered by warranty