I just flashed this ROM, but have no sound

The HDMI cable is the same, the same ports, etc. Tried to insert them back, change, etc. No luck. No sound at all from my pen.
In stock rom it was working :/
can I troubleshoot this somehow? i believe it's an audio driver issue, but I'm not familair with Linux
I tried to flash again the ROM, everything went good, but still no sound, one more time

Any help is appreciated - i might consider return to stock rom as well, if can't find a way to have sound.
Thanks
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