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BK7231N/CBU Module Aliexpress: Non-Standard Encryption Key, MAC Address Issue

dgel27 87 2
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  • #1 21765650
    dgel27
    Level 7  
    C8478C428848C8478C428848C8478C428848C8478C428848 Hi,
    I have ordered from AliExpress 2 breakers:
    aliexpress.com/item/1005008706471373.html
    Inside - module CBU, that in past I updated it with BK7231N mode.
    Now, I cannot update it; the program said:

    Going to read encryption key...
    Encryption key read done!
    Encryption key: 00ef7800 00ef7800 00ef7800 00ef7800
    ^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^
    WARNING! Non-standard encryption key!
    If it's all zero, it may also mean that read is disabled.
    Please report to forum https://www.elektroda.com/rtvforum/forum51.html 
    Or just try using BK7231M mode 
    ^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^


    The 2 modules have different key values.
    I can write it with "Skip check key" on; the CRC check is passES, but the module does not come up after that.
    Same happens when I write it using BK7231M mode.

    The module boots when I use BK7238.
    It can operate, but the MAC address stays the same for both devices - C8478C428848, and it is not possible to change it from WEB - the device gets stuck, and after reboot it has the same MAC.
    Attached original CBU's image
    Is it possible to add support for this? Or at least a way to change MAC address?

    Thanks! readResult...-29-57.zip Download(793.97 kB)
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  • #3 21765771
    dgel27
    Level 7  
    Yes, it's CBU. At least PCB and shield markings. Maybe they changed the chip, if it's pin-to-pin compatible...
    It was also strange for me,

    Close-up of WiFi module with soldered wires and visible PCB markings

    I have used CBU before...
    Thanks!
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