It may seem pretty obvious but I can’t get it to work. I want to program my stm32f303k8 board with XOD. I found a post that mentioned a .json file from dandrown.org that can be placed in the extra.txt in the packages folder, so I tried that and it seemed to work, however my board was not among those defined in this file. So I had a look at the stm32duino github site and found this file: https://raw.githubusercontent.com/stm32duino/BoardManagerFiles/master/STM32/package_stm_index.json
which does contain my board (in fact both my ST boards) so I put that in extra.txt. Unfortunately xod didn’t like the file. I got this error
I forgot to mention there was already another source .json in the file, apparently for ESP8266 type boards. I don’t have any of those so I deleted it and left the STM32. Tried again and it worked this time. It seems XOD can’t handle two source .json files in extra.txt.