Updated versions of the firmware are available on the Downloads page. The update contains several enhancements and corrections summarized in the change history. Perhaps the most significant change is the ability to enable/disable interrupts and use the Atomic Block construct with VM mode devices.
Barring the discovery of any problems that need to be fixed, this will likely be the last VM update for the discontinued mega32-based ZX devices.
VM Update - v2.5.0
VM Update - v2.5.0
- Don Kinzer