Rak4631 : Necessary reset after power on?

Hello everyone,
I would like to make tiny Lora tracker with Rak5005-O, Rak4631, Rak1910 and a power switch.
I bought several parts by two different ways : Rakwireless shop and Marcom srl.
With Rak4631 bought in Rakwireless shop, everything is OK, but with Rak4631 bought in Marcom srl website, when I power on the board with battery or USB, I must press reset button, if not, nothing append.
I switch Rak5005-O and Rak1910, but It seems that Rak4631 is the problem.
I use the same program (RAK4631-DeepSleep-LoRaWan.ino with Rak1910 modifications) for both.
I have four Rak4631 from two shop.

Note :

  • There is two version of Rak4631 : “Rak4630” written large (Rakwireless Shop), “Rak4630” written small (Marcom srl)
  • With Rak4631 (Rakwireless Shop) when I power on, Green light is on, not for other, even if i press Reset.

It is a known issue ? There is a way to not press Reset button when I power on the board ?

Thank you.

Welcome to the forum @mmdeveloppement

Looking on the labels in the pictures, the one on the right side seems to be quite old (it is missing the IC certification number on the label).

Most likely they are still flashed with an old bootloader version that had a problem with the RAK1910 module.

Can you try to update the bootloader to the latest version following the guide in our Documentation Center

Hello @beegee

I try it and it works perfectly.
Thanks a lot for your assistance.