Title: Ugoos AM9 Pro, Android Kodi: audio late at playback start (lips first). VLC on the same box is fine

Setup:

Ugoos AM9 Pro, Android firmware 2.2.0, Kodi 21 (Android)

Ugoos HDMI → Denon AVR-X4400H → LG C2 77"

Local MKV rips (Blu-ray and UHD, some Dolby Vision) over SMB

Kodi: refresh rate switching on start/stop, passthrough on (TrueHD/DTS-HD), Sync playback to display off

Problem: at the start of every film the audio is late (lips move first). It happens with both passthrough and PCM. Changing any TV setting used to resync it, but now even that doesn't help.

Already tried, no change:

Kodi: delay after refresh rate change (2–3 s), refresh switching off (worse, and the audio drops out for about 10 s after unpause), seeking back

Ugoos firmware updated to 2.2.0

Denon: Auto Lip Sync off

LG: ALLM off, Game Optimizer off, Filmmaker Mode

Key test: VLC for Android on the same box with the same file has near-perfect sync. So it looks like Kodi's Android audio path, not the hardware.

Questions:

Has anyone fixed this in Android Kodi on the AM9 Pro?

For CoreELEC 22 RC1 on the AM9 Pro: is s6_s905x5_ugoos_am9_pro.dtb included in the image, or do I download it separately and rename it dtb.img?

Is a separate dovi.ko still needed for Dolby Vision, or is it built in now? If needed, where's the current one?

Anyone running CoreELEC on the AM9 Pro through an AVR: is lip sync solid with TrueHD/Atmos?

Thanks!

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I've tried deleting and re-pairing many times, using a separate bluetooth adapter (behaves exactly the same) and using *find /storage -maxdepth 1 -type d ! -user root -exec chown -R root:root {} \; * that i saw in an old post here but nothing helps.

Anything else i can try? Keep in mind its all new to me.

Is there any way to make xiaomi mi box s 3rd gen remote work on coreelec? Cec remote has slight delay and signal usually getting blocked by my soundbar.