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BK7231N Flashes Successfully but No AP, Dim Blue LED, No Function After Firmware Restore

philip3 69 2
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  • #1 21718054
    philip3
    Level 2  
    Hi,
    I tried following this guide https://www.elektroda.com/rtvforum/topic4113539.html
    It looked like everything went fine, the flasher reports "success" at every step. However now the unit powers up, the led glows blue, but quite dim, no AP, no function. I tried flashing the original firmware back, unfortunately, same behaviour. I tried with 3.3V directly to the BK7231N, also with external 5V to the regulator of the board, tried different USB-UART adapters, two different PCs, I also tried the older flashing software. Tried multiple times in every combination I could think of.
    Any idea what else I can try?
    Flasher produced this data when I made a copy of the original firmware.
    
    Device configuration, as extracted from Tuya: 
    - Pair/Toggle All Button on P24
    - WiFi LED on P8
    - TglChannelToggle (channel 1) on P6
    - Relay (channel 1) on P26
    Device seems to be using CB2S module, which is using BK7231N.
    And the Tuya section starts, as usual, at 2023424

    
    {
    	"rl1_lv":"1",
    	"on_off_cnt":"10",
    	"onoff_rst_m":"1",
    	"onoff_clear_t":"10",
    	"rand_dpid":"42",
    	"net_trig":"4",
    	"onoff_n":"3",
    	"netled1_lv":"0",
    	"jv":"102",
    	"onoff_rst_type":"2",
    	"total_bt_pin":"24",
    	"nety_led":"2",
    	"total_stat":"2",
    	"reset_t":"5",
    	"netled1_pin":"8",
    	"remote_add_dp":"49",
    	"remote_list_dp":"50",
    	"net_type":"0",
    	"inch_dp":"44",
    	"module":"CB2S",
    	"ch_cddpid1":"9",
    	"onoff1":"6",
    	"clean_t":"5",
    	"init_conf":"38",
    	"zero_select":"0",
    	"onoff_type":"0",
    	"series_ctrl":"0",
    	"total_bt_lv":"0",
    	"cyc_dpid":"43",
    	"remote_select":"0",
    	"ch_num":"1",
    	"rl1_pin":"26",
    	"netn_led":"2",
    	"ch_dpid1":"1",
    	"crc":"20"
    }
    
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  • #2 21718123
    DeDaMrAz
    Level 20  
    Plug the device from power, wait couple of seconds and power it back on. Provide more info like a log from flasher maybe.

    Confirm CEN pin is not shorted to ground maybe if even your backup is not working.

    How are you determining there is no AP?
  • #3 21718139
    philip3
    Level 2  
    >>21718054 Hi,
    I see that there is no AP by checking on my phone and on my computer for the AP from the firmware, I left the device powered for >30 minutes, still no AP visible in the list of Wi-Fis. I tried powering on/off in various ways (much like you suggest). I will post some logs tomorrow when I am back at the computer, even though it shows "success" at every step, there may be something in it that I did not notice. I will check the CEN pin, that is a good idea, thanks.
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