PSR-800 DSP version?

I'm still trying to get my scanner updated to P25 phase 2. I've updated Grecomm's EZ scan software to the latest version. I've updated the cpu to version 1.8 and the dsp firmware to v. 1.3. It seems as though I read in a thread here that the dsp firmware needs to be v1.7? I've read so much about this lately I could have that mixed up. When I click on the dsp firmware update button within EZ scan it says I already have the latest version. My question is do I need this elusive v1.7 and if so where and how can I get it.

Jarrell