I have a 1gb SD card for the PR100 which Yamaha has said should suffice.
Also on the ftp server are instructions, but they actually don't tell you what to do with the software, just how to do the upgrade once you install the SD card with the new files. I use a Mac; is that a problem? I have PCs in the store.
What I'm trying to do is to get this C3-MKIVPRO upgraded so we can run Disklavier TV and Disklavier Radio. Where I'm stuck is that I can't use the PRC100 because it will not connect to the MKIV unit. The WiFi cards were tested at Yamaha and appear to be fine. Once I can control the MKIV with the PRC100, I can check the MKIV OS and update it as needed I suppose. Then I can finally hook up all this Apple stuff - AirportExpress, Apple TV - and get TV and radio going.
I have to now head back to the customer's home and noodle around again, hoping to make a connection. There are no DKV experts anywhere in the area, and the nearest dealer/friend I spoke with is in the same boat as me: We joined Yamaha as dealers in the E3/DKC800/850 era. Now I'm learning Enspire, but there are literally dozens of MKIVs I'm trying to service and we're really stuck. If only I could just plug a DKC850 into it, but alas, that's not an upgrade path for the moment.
Any/all suggestions welcome.
Vince Chambers
Apollo Piano
Chico, CA