I just got off the phone with Escort. I asked if the ZR4 firmware can be updated and likewise if the shifter firmware for the 9500ci can be updated. Here is what Shelley told me:
-- So far, no shifter algorithm updates have been released for either the ZR4 or the 9500ci.
-- Any future updates for the 9500ci shifters would be included as part of the software download.
-- Any future updates for the ZR4 shifters would simply require sending in the ZR4's interface module.
-- Any hardware updates such as newer and more powerful shifter LEDs would require sending in the shifter modules.
Shelley has become a very knowledgeable customer support wizard! She was able to instantly answer these questions for me.