There is a program that extracts the entire flash content or just the firmware. This is available at Digi's website under 9.62A release. You can find the latest release below;
Is also available on Dynamic C 9.62 github, https://hub.digi.com/support/products/dynamic-c/?path=/support/asset/dcrabbit-9-on-github/.
The program runs in ram and does a dump of the flash or firmware in the device, whichever you specify. So you should NOT compile it to flash because it will erase whatever is in flash, it will need to be compiled to RAM.
You will need a programming cable part# 20-101-1183 to extract the flash and Dynamic C programming environment. Your module will need to be connected to a development board or your own hardware. Follow the instructions provided in the extract_flash program located in the following path once you install Dynamic C's development environment; C:\DCRABBIT_9.62A\Samples\extract_flash.c