Unable to connect the dash

Hi all,

I tried to connect the dash after some time not using it and it does not work at all.
I have followed the process to connect via bluetooth but it wouldnt sound and the they dont appear on any device I have tried.

I have updated the software using the computer but still it wont work.
Both dashes are fully charged and I have also done the restoring procedure (first left, then right dash)… still wont work and wont appear on any bluetooth device.

Any thing I am missing??

any help is welcomed!