Does it have a STM32 MCU at all ?
You would need to identify the MCU variant first, a schematic would be helpful, too.
As a next step, you could try to attach a ST-Link or another JTAG pod, taking Discovery/Nucleo boards as hardware reference.
If the pins for JTAG/SWD are hooked up otherwise, or the device firmware was ROP enabled, this approach might fail.
The system bootloader (BOOT0/BOOT1 pins) with the Cube Programmer (or the older FlashLoader Demonstrator) are worth a try.
> Radio will not switch on ...
I suppose the half-done firmware is crashing underways, or refuses execution because of an initial integrity check.
