Today I found a portal owned by my faction that had a full house of 8 L1 resonators. I have a couple L2 resonators in my item inventory and wanted to deploy one. From the portal's main actions screen I selected
Upgrade. From there I was shown a close up of the existing resonators that I could cycle through. Unfortunately, the
Upgrade option on each of them was grayed out for me. Clicking on it only produce a text-over error:
No usable resonators
I checked my items list and there are still two L2 resonators in my inventory. What am I doing wrong? How can I deploy these resonators to the portal?