MAXREFDES70 contains Silicon Lab's EFM32ZG110F32-QFN24 microcontroller in it. In order to develop a new firmware for the MAXREFDES70, it requires Silab's Simplicity Studio and GNU ARM toolchain.
For more information on the tools and Debugger attachments please go through the link below:
https://github.com/maxim-ic-flow/maxrefdes70