Firstly, I assume the replacement deck was a Kenwood unit [you neglect to say].
If so what model is the new unit?
Assuming you are using a Kenwood unit, go into PhatNoise Media Manager 3.92, and:
1. Go to Tools/Options
2. Click on 'Firmware / Plugins' in the list on the left side
3. Click on 'Update Firmware'
4. Click on Next
5. Click on 'Check for updates on PhatNoise website'
6. Choose 'Kenwood Brand Stereos'
7. Click on 'Next'
8. Complete the wizard.
This will ensure that your firmware is the correct one, and bang up-to-date.
Eject the DMS from PMM 3.92 and then stick the it back in the PhatBox, and make sure it loads up okay.
Then, follow these instructions on loading SSA/VIOT:
http://wiki.phathack.com/VIOTNote: If you have used the Hack to create a custom DMS and are adding SSA to that DMS, only perform steps 4 and 5