Deprecated flags from v2.02 ( --sync-legacy , --no-async-poll ) are now fully inert. Calls to them produce a warning but do not error. Direct API consumers must migrate by v2.04, as the warning will escalate to a hard exception.
Because v2.03.74r is not a mainstream consumer software version (you won’t find it on Windows, macOS, or iOS), its presence is confined to specialized ecosystems. Based on pattern analysis and user reports, here are the most probable candidates: v2.03.74r
The version refers to a significant firmware and software release for EPON Optical Line Terminal (OLT) Deprecated flags from v2
: Fixed segment errors related to TACACS+ web configuration. Deprecated flags from v2.02 ( --sync-legacy