It only works with firmware versions 1.19 and higher, because needs to support ACK command. However version 1.25 is recommended because there are some bugs in LX200 protocol in previous versions.
There are no known bugs for this driver. If you found a bug, please report it at INDI's bug tracking system at SourceForge. (You can log in with a variety of existing accounts, including Google, Yahoo and OpenID.)