My ZWO EAFs work well with KStars 3.6.0 and Indi 1.9.7 (in the most recently updated Astroberry image) . I am now testing more recent KStars/Indi versions under Raspberry Pi 64-bit OS 'bullseye'. These are working well with my mounts, cameras and Pegasus PPB, but in each case the focuser is not found. I have tried all three ZWO focuser options (ZWO> ASI EAF, ZWO> ZWO EAF and ZWO EAF), and double checked cabling and power supplies. Any ideas, or is the ZWO EAF 64-bit Indi driver in need of an update?

I also encountered this bug after a fresh install of Kstars 3.6.4 Stable on Linux Mint 21.1 and ZWO EAF firmware update 3.7.7.

I created a GitHub issue ticket in the INDI project

ZWO/ASI EAF: can't connect with INDI Library v2.0.1 (undefined symbol: EAFStepRange) #1895
INDI Library v2.0.1
ZWO EAF firmware v3.3.7

Device no longer appears in INDI Control Panel. It does appear in ASILive's EAF control panel so physical connection is valid.

When trying to Run Service "ASI EAF" using KStars Device Manager:

2023-05-08T05:03:16: FIFO: start indi_asi_focuser -n "ASI EAF"
2023-05-08T05:03:16: With name: ASI EAF
2023-05-08T05:03:16: FIFO: Starting driver indi_asi_focuser
2023-05-08T05:03:16: Driver indi_asi_focuser: pid=6603 rfd=10 wfd=10 efd=11
2023-05-08T05:03:16: Driver indi_asi_focuser: indi_asi_focuser: symbol lookup error: indi_asi_focuser: undefined symbol: EAFStepRange
2023-05-08T05:03:16: Driver indi_asi_focuser: stderr EOF
2023-05-08T05:03:16: Driver indi_asi_focuser: read: Connection reset by peer
2023-05-08T05:03:16: Driver indi_asi_focuser: Terminated after #0 restarts.

My bad. libasi is the ZWO SDK and I didn't notice that the Linux Mint Update Manager wanted to install v1.28 (running version was 1.21). I was able to connect after completing the update.