[CA] [CA11] SPX-30/ST6002 No Rudder Reference after SW Update

[EvanM]

I just finished reinstalling the SPX-30 and ST6002 that came with the boat when I bought it. I added a new Rotary Rudder Reference Transducer.
Wired everything up, triple checked it, and powered it up. All indications looked good, including the rudder reference bar on the ST6002 and also the rudder angle on my eS78 (set up a data box for it).
I then powered the eS78 down, inserted a microSD card with the v3.50 v7 SPX-30 update, powered it on, and watched the update complete. Hit the eS78 power button at the end, everything powered up OK. Rudder reference, check.
Took it out of standby, the clutch engaged, and I immediately got an alarm that I lost Rudder Reference. Sure enough, no bar on the ST6000 and 0.0 on my eS78 Rudder Angle data box. I may have been hard over, which I know the SPX-30 doesn't like at startup. But a power cycle with the wheel centered should have cleared the issue. However, it didn't.

Troubleshooting done so far:
Centered the wheel, did a power cycle. No change. Repeated 3 more times.
Checked resistance of the rotary reference sensor per FAQ...all good.
Reconnected, power cycled. No change.
Scoured this forum and the internet. No luck.

Help?

Configuration:
eS78 Lighthouse II R19
SPX-30 v3.50 v7 download, connected via STNG
Fluxgate compass
ST6002
NEW M81105 Rotary Rudder Reference Transducer

Thanks,
Evan