LD2451 Bluetooth no longer advertises after using firmware code FVTAWN.

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ld2451

LD2451 Bluetooth no longer advertises after using firmware code FVTAWN.
Module responds over UART at 256000 via CH340.
5V power is stable.
Blue LED is off.
HLK Radar app and LightBlue cannot detect it.
Please provide the latest LD2451 firmware recovery method/package for UART update, or the correct code to restore Bluetooth advertising.

3 Answers

Hello, could you pls help to answer following questions from our engineer team:

  1. If the firmware upgrade has been performed on our Bluetooth app?
  2. What is the version number of the Bluetooth app?
  3. Will the module currently report data?
HLK-Ellen281

Hello,

  1. Yes, the firmware change was performed using the HLK Radar Bluetooth app.
    I entered the firmware code FVTAWN in the app’s firmware/code update section.

  2. V1.8.36

  3. Yes, the module currently reports data over UART.
    It responds at 256000 baud via CH340 and sends serial data packets after power-up/restart.
    However, Bluetooth does not advertise at all. It is not visible in HLK Radar app or LightBlue.
    5V power is stable and the blue LED is off.

Brian•

LD2451 UART firmware recovery package, not the public serial protocol.
The public download page only has protocol/manual/layout/app demos.
Bluetooth is not advertising, so app update is impossible.
Please provide the firmware .bin and official UART flashing software.

Brian1

Hello, We’ve run into a problem.
You can only use our Bluetooth app to upgrade back now, but Bluetooth cannot be searched and cannot be upgraded back. To use firmware to upgrade it back, you must use a programmer, but you don't have one on your end.

HLK-Ellen281
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