You would need CPS 16 in order to read the radio in its current state, then try to update using CPS 16 to something closer to ancient, even if you can't get to S 01.17. The S 01.17 was a special release to fix an audio issue, the R 01.16/17.xx should still work. Once you're into the realm of new enough, you should then be able to read it/change it/write it with CPS 2.0
If you're paying someone else to do it, it's rarely worth it. If you take it on as a learning project, then maybe it's worthwhile, but you've made the radio less desirable to 90% of the folks who would rather have the radio still using CPS 16.
If you need to get CPS16 to start with, I'd just stay with CPS16 for that unit, but that's me. I avoid using CPS2 for nearly everything except new radios.