Solved access to PA20 , I2S bus 0 pin for ver1.14. Find U58 near antenna connector, open pin 3 connection (Enable pin for Wlan). On the pad remain PA20 , DataOUT for the I2S DAC.
Connect IC U58 pin 3 to any 3.3Vcc. The Wlan will be powered continuously and DAC will be up and running.