I updated the firmware on 2 of my LD2451 modules.
Now, they no longer work. Only the blue light blinks, and there is no reading of approach or distancing objects.
A refresh of the firmware update did no resolve the problem.
I tried a serial port connection and the problem continues.
The reading of the device in the HLK raday stays at 09:00:00 all the time.
How can I go back to an older firmware?
I got an answer from technical support.
I used the firmware code FVTAWN to go back to firmware 24072217. I could not connect to the LD2451 with Bluetooth.
After connecting with the CH340 and set the configuration command ( FD FC FB FA 04 00 FF 00 01 00 04 03 02 01),
I needed to do the restart command :
FD FC FB FA 02 00 A3 00 04 03 02 01
The module will restart and connect to the HLK Radar Tool. (no blue LED blinking)
thank you
Thank you for your information, I met the same problem today. And finally fix it by your sharing. As a supplement, there is a function named "Code update" at HLK radar APP's device's firmware tab, you can give the code "FVTAWN" there.
after the firmware update, there is no device was found in the APP, and I tried your 2 commands, but nothing was found. then I tried the 3 commands mentioned in another discussion, the first trial was still not working, but luckily the 2nd it works:
FD FC FB FA 04 00 FF 00 02 00 04 03 02 01 Enable
FD FC FB FA 04 00 A4 00 01 00 04 03 02 01 Enable Bluetooth
FD FC FB FA 02 00 FE 00 04 03 02 01 Disable
https://ask.hlktech.com/question/276895.html
