HifiBerry DAC2 pro, no headphone output

Hey, I've recently purchased Raspberry Pi 3B+ and HifiBerry DAC2 pro, and I'm using them with piCorePlayer 8.1.0 (Kernel 5.10.77). The RCA output is working like a charm, but it seems that I can not unmute headphones. Please let me know if someone has similar setup and/or solution to this issue. 

P.S. Please bear in mind that I'm complete noob at the moment, so I would appreciate detailed pointers/instructions. 



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