Keep your APs current, and they will serve you reliably for years to come.
If you need:
Also check archive sites like ftp.equipment.com/pub/firmware/legacy/ ap3g1k9w7tar1522jbtar download upd
The string "ap3g1k9w7tar1522jbtar" appears to be a specific technical identifier, likely related to a firmware update Keep your APs current, and they will serve