HK1 X50 / BM201-4g (S905X5M): public BSP, kernel and build sources?

Hi everyone,

I’m looking for publicly available or officially released sources for the HK1 X50 based on Amlogic S905X5M. The firmware identifies:

Device tree: s7d_s905x5m_bm201-4g

Kernel: 5.15.170-android14-116a317110

Build: eng.user.20260617.000209

Does anyone know a source release or repository containing the corresponding kernel/device-tree sources, U-Boot/board configuration, and BSP build instructions?

I found this BM201 Android build guide:

It documents a BM201 setup, but I haven’t established that it matches this hardware revision or found a complete matching BSP.

I’m trying to identify the correct sources and build configuration, rather than request an Armbian image or official support for the box. Links to public releases or the appropriate vendor source-request contact would help.

Thanks.