SMSL SU-X Bluetooth issue

[nevermind]

Hey guys!

I have SMSL SU-X for a month and I love it.
But this morning I wanted to play some music but I couldn't connect by Bluetooth.

I've tried to reset Bluetooth paring on my phone as well as reset DAC. Unsuccessfully.

Also I was trying to update firmware, but attempt also failed. The instructions are not so good at all.

So I came here. Maybe someone had the same issue and found the solution. What could have happened and how to fix it?

 

[SPCL9806]

Do you remember what the SU-X displayed when Bluetooth was working? When I connect my phone to my SMSL DO300EX DAC, it would replace "44.1 kHz" with "LDAC" until it recognizes a connection has been made and will then display "aptX".