I have a RAK11720 breakout board and i cant upload firmware anymore because the bootloader is running stock. So i bought a Jlink edu mini from segger to upload the firmware via SWD but it fails to connect. Iam using the following connections:
Jlink TO RAK11720
ground → ground
SWDIO → SWDIO
SWDCLK → CLK
nReset → RST
Boot 0 → Gnd (tried also with vdd)
And the RAK11720 is powered by the RAKDAP1, further i using a common ground from RAKDAP1 to Jlink edu mini.
Iam unable to connect to the target and receive the error"trying to connect under reset". Like here below:
I tried to put the reset pin of the Jlink edu mini to ground with a pull down and also to VDD but nothing changes. I dont know how i can connect the RAK11720 to reset the firmware… Any help is welcome!
Can you check whether the Jlink edu mini is supporting the AMA3B1KK-KBR?
I am not sure (I have a full fleged Jlink) if the “education” versions are supporting all MCU’s
Other than that I am out of ideas if
you have proper 3.3V supply
all wires connections are made correct
no loose connections