Analogue-sequencer

I had a look at enapas P3 kit today and noticed that he's got an old kit with a 18MHz crystal. This means that the firmware available for download will not work since it is for running the AVR at 24MHz as far as i know. 

The problem is that it will only run the first step in every pattern. If you skip the first step, it will just repeat the second step... Editing/clearing the patterns have no effect to this behavior. 


We tried the CPU from my P3 in his kit and everything worked except MIDI since running my CPU at 18MHZ means that MIDI will be scrambled up. 

We also tried his CPU in my P3 and we got it running there, a bit surprisingly, at least after clearing the patterns, they seemed to have skips on every single step. 
Unfortunately since the firmware in his CPU is for running at 18MHz we could not update anything there either. 


My conclusion right now is that he needs a new crystal(24MHz) and an updated CPU with a modern firmware. 
I only have an STK-500 development board and it can not read this specific CPU, I wanted to try to flash his with the contents of mine. 

Is it possible to buy a new CPU with the newest firmware and bootloader, or is there another way of flashing the one he has(some special FW)?