[BK7258] Bauhn Video Doorbell AIBSDB-0426 teardown - Tuya board, flash, camera

Hi! Here is a teardown of a Bauhn Video Doorbell I bought from Hofer/Aldi Austria.

The doorbell was really cheap (20€). I tried integrating it inside HA with the local-tuya integration, it works but the delay is too massive for me.

Model: AIBSDB-0426
Tuya Product ID: uafj1ef67agsubgo
Board: IP15_MAIN_WX_V04 (20251207)

Pictures:






Main SoC: Beken BK7258QB86616 (module: CU5385XC)
Flash: MX32.7Dh
Camera: KXD-ANK6097 (IP15B, OXQ1V2.1)

Reset button (red) accessible on PCB.

Tuya Protocol: 3.5
Works with: tuya-local (Home Assistant)
DP 212 fires on doorbell ring (ipc_doorbell event, Base64 encoded JSON with S3 URL I think a preview image. I didn't attempt to receive it for now)

Flashing:
Not yet attempted. Looking for community help - is BK7258 supported by OpenBeken?

OpenBK does not currently support BK7258. Easy Flasher does support reading the flash though: https://github.com/openshwprojects/BK7231GUIFlashTool

even with basic BK7258 support I imagine it'd be a lot of further work to then get anything like a functioning cloud-free doorbell firmware

though there does appear to be samples/demos about

https://dl.bekencorp.com/SDK/bk_avdk_smp
https://github.com/bekencorp/bk_solution_doorbell

Just got one of these and took it apart to see pretty much what you showed and had started to dig to see what was supported. I did not see any support from OpenBK either and don't want to use existing tuya-local support. Not too big into local-tuya working, would rather see it integrated into OpenBK or the likes.

It is a source of 2 18650 batteries (1200 mAh 3.7 V) if nothing else ;)

I'll try and pull the firmware and see if easy to push/pull it for going forward and have a look at some of the demos and how much the SDK differs to the current OPenBK integrations.

2 UARTs that I can see - one 4 pin (5 V, TX1, RX1, GND) and another 3 pin (TX2, RX2, GND) - from what I saw the 4 pin is for the flashing and the 3 pin is just for monitoring and has no flash ability. Note the 5 V should not be sent to the board and 3.3 is the max from what I've seen across the TX/RX.

oops. moment of madness. bought one