In the context of networking hardware, a "repack" typically refers to an unofficial firmware image that has been extracted, modified, and repackaged by third parties.
Huawei typically pushes firmware based on specific carrier or regional requirements, meaning there is no single "universal" firmware for every B818-260. Teltonika Networks Official Update Procedures Huawei B818-260 Firmware Download REPACK
Top IoT Security Risk or Why You Must Update Router Firmware In the context of networking hardware, a "repack"