RAK4630 UF2 and Bootloader

LPWAN Modules / EVBs RAK4600
1

Issue: RAK4630 not going into UF2 mode.

Setup: RAK4630 on custom PCB

Details:

  • RAK4630 is detected by windows
  • double pressing the reset, it doesn’t show UF2 (disk drive).

Question :

  1. How do I check the version of the bootloader?
  2. Is UF2 bootloader loaded ( received units directly from RAK store )
  3. RUI3 version : RUI_4.0.6_RAK4631
  4. I have a JLINK, incase I need to update anything.

I followed this too :

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image1105×286 31.2 KB

It flashed, and is detected by windows

image

When I now use the serial terminal, I get no comms from the device?
Double hitting the reset button only resets the device…there is no UF2 drive

So given a blank RAK4630 device…what are the steps to recover this ?

  1. Load the RAK4631-RUI3-V4.1.1-Flash-Dump.hex …and then? Do I expect it to respond to AT commands?
2

RUI3 does not support UF2 bootloader mode.
RUI3 is using a different bootloader than Arduino.

You can force bootloader mode with AT+BOOT

USB communication is with 115200 baut 8N1

You need to supply 5V to the pin 1 VUSB of the module in addition to the other supply voltages.

3

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