Don't panic, no damage done as far as I am aware.
If your reading is 01 after resin have you checked the reading pre - resin?
This is the reading that matters most as you will see more about what is happening with your RO filters etc...
You have just changed your resin the reading should be 000 at least for a while anyway.
Have a look at the water from the RO, will give you more idea whats going on.
Best wishes,
Trev