How to flash and dump firmware for mini-camera BK7252NQN481 INO-A9-v2.5?

Hello,
I’m new to the forum and I’m trying to dump the firmware from a mini camera based on the BK7252NQN481. The PCB is marked INO-A9-v2.5.

I managed to get access to the RT-Thread shell through the UART pads, but when I use BK7231Flasher / Easy Flasher to back up the firmware, I get an error message, as shown in the attached screenshot
My setup is:

- camera connected to a USB-UART adapter,

- camera powered from its own power supply,

- UART shell access works.



What I do not understand is the CEN signal. From the BK72xx documentation, CEN is the reset pin, and flashing usually starts only if CEN is briefly pulled to GND, or if the board is power-cycled while the tool is already waiting for the chip. I do not know where CEN is exposed on this board, or whether I should instead use power-cycling.

Could someone please advise:

whether this board should be dumped through UART1 or another interface,

how to identify the CEN pad on an INO-A9-v2.5 board,

and what the correct backup procedure is for this BK7252NQN481 camera?

Any help would be greatly appreciated.

applying power is fine too if the CEN pad is not routed out.

but you need to choose the correct BK7252N



while you can flash OpenBK7252N there is currently no cam support in the release.

>>21897252 Thanks for the reply. Already tested with to flash with BK7252N(T4) and had the same error, so I guess I need to apply power on the CEN pin, but where is the CEN for this board? How can I find it?

ah OK. I see the battery is still soldered. I think this might get in the way, so I've always made a point of desoldering it.

I removed the battery and did short the CEN with GND, but the process of extracting the firmware didn't complete. It started, then stopped, as shown in the screenshot.

Maybe something not quite right win32 running on whatever OS you're using.

Give BKFIL a go? https://dl.bekencorp.com/tools/bkfil/v4/gui

It does full read and write too