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<span style="color:Black;font-weight:bold">Q4: What should I do if encounter an error message: Failed to open "alsa" (alsa)？</span>
A:
# Only 5 wires are connected to PI 4, so pls make sure that the connection between X950 DAC and PI 4 is well and reliable.
# Pls make sure that the Pi 4 firmware has been burned completely.
# Make sure the configuration in VOLUMN Volumio is correct. (VOLUMIO 3 is not supported temporarily, '''please use VOLUMIO 2 or other OS to play''', we are communicating this issue with VOLUMIO.)
# Do not use X950, just use the official firmware of Raspberry Pi 4 to check whether the Pi 4 motherboard is working properly.
# If you have the official dac of Raspberry Pi 4, you can also use it to test the firmware