Homatics Box R 4K Plus

Ok folks, need a hand here.

Tried several methods to boot into Corelec without success.

I recently got my box with Android 14 firmware v14.8.2463.
Tried to follow this guide here:
https://discourse.coreelec.org/t/guide-homatics-box-r-4k-plus-coreelec-installation-configuration-and-modding

but firmware v5310 is not available to me. I’ve seen people claiming I should be messasing EllaHomatics or something but talking with the Telegram team it should be able at least to boot into Corelec.

I’m trying to use CoreELEC-Amlogic-ne.aarch64-21.2-Omega_nightly_20250726-Generic.img.gz

with the sc2_s905x4_sei_smb_280.dtb file renamed to dtb.img at the root file system.

Tried several reboot methods, adb reboot update, holding the reset button with a tooth pick (which put me in service menu), tried using reboot to coreELEC apk.

Tried balena etcher, tried Rufus for flashing.

Still no go.
Tried 2 different usb sticks.

Is this a firmware lock thing?