Shenzhen Pinmei / Linklemo A9 Mini Camera with Beken BK7252NQN481 – Photos, Boot Log, Flash Backup

divadiow 2556 32

#31 21584909 20 Jun 2025 19:16

divadiow divadiow

Level 34

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Post #31
21584909 20 Jun 2025 19:16

insmod wrote:
BK7252N build, untested.

congratulations. 1680_merge_55ebe0a12aba QIO flashed:

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only BL log from TX pad on this device. OTA is successful to and from 1680_merge_55ebe0a12aba and _7231u_t_b0f287a571d0
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Added after 3 [minutes]:

P2 is blue LED on this A9 and it is controllable
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#32 21584931 20 Jun 2025 19:30

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #32
21584931 20 Jun 2025 19:30

That's the great news! I assume it's the new PR that was open?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#33 21585752 21 Jun 2025 20:44

divadiow divadiow

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Post #33
21585752 21 Jun 2025 20:44

p.kaczmarek2 wrote:
That's the great news! I assume it's the new PR that was open?

yes. I think I need to try turning a couple of these BK7252U/N cams into dev boards or something. I fear some of the test pads are getting a bit ropey with all the soldering and moving about.

Added after 46 [seconds]:

or find some BK7252U/N modules I suppose
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Topic summary

The Shenzhen Pinmei / Linklemo A9 Mini Camera featuring the Beken BK7252NQN481 SoC is a low-cost Wi-Fi surveillance device often marketed with exaggerated features such as 4K resolution and advanced AI capabilities. Analysis of the device's firmware and boot logs reveals it uses a GC0329C image sensor (0.3MP, 640x480@15fps) rather than a true 4K sensor. The device broadcasts an access point (SSID: LLM_H0A9_xxxxxx) with default credentials and assigns IP addresses in the 192.168.9.x subnet. Network scans show open TCP and UDP ports, but attempts to pair or access the video stream locally without cloud interaction are limited or time out. The firmware is based on Beken chips related to BK7231 and BK7238 families, with bootloader and flash memory characteristics discussed, including flash size (4MB with 2MB wrap-around) and encryption key readout issues. Attempts to flash BK7238 firmware were unsuccessful. The device requires cloud-based app registration for full functionality, and local mode restricts configuration changes. Current open-source firmware support is limited, and no stable method exists yet to access the video stream from Windows or replace the firmware to unlock full local control. The discussion highlights the diversity of A9 Mini camera variants with different chipsets (BK7525, BK7525N, XF16) and the need for further reverse engineering to enable local streaming and firmware modification.
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