I had a problem with no sound on my RPi4, turned out the kids had turned the volume right down on the TV.
volume right up on the TV NOK
Usually people have at least analogue audio. Can you make a microSD with Raspbian and update the RPi firmware from there?
PS: Background: Maybe another RPi OS updated the firmware (you use multiple cards), and with that firmware LE can't provide audio.
Code
pi@raspberrypi:~ $ vcgencmd bootloader_version
Dec 11 2020 11:15:17
version c3f26b6070054bca030366de2550d79ddae1207a (release)
timestamp 1607685317
update-time 1609420705
capabilities 0x0000001f
pi@raspberrypi:~ $ vcgencmd bootloader_config
[all]
BOOT_UART=0
WAKE_ON_GPIO=1
POWER_OFF_ON_HALT=0
DHCP_TIMEOUT=45000
DHCP_REQ_TIMEOUT=4000
TFTP_FILE_TIMEOUT=30000
ENABLE_SELF_UPDATE=1
DISABLE_HDMI=0
BOOT_ORDER=0xf41
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I think this is good >> next NOK
try again with an SD card with a USB flash drive beast USB drive SSD drive USB drive NOK
but first of all what parameters to put in the oven with a new Raspberry Pi 4 config.txt, guisettings.xml, ....
thank you so much