These steps are from github.com/DVMProject/dvmv24. You should read it.
If your DVM V24 board has current firmware skip down to DVM Host Configuration. If the pre-built binary firmware is current skip down to Flash Firmware. Chances are neither is true and you'll need to build and flash new firmware.
The ARM toolchain is needed to build the latest firmware. On Debian and derivatives, the package you’re looking for is gcc-arm-none-eabi, thank you Stack Exchange.
apt install gcc-arm-none-eabi
With the ARM tool chain installed, build the firmware:
cd /usr/src
git clone https://github.com/DVMProject/dvmv24.git
cd dvm24/fw
make