Directories .../v3.x-5/... contain firmware images potentially exceeding 4MB in size.

These are meant for and automatically addressed by modules running the upgraded
7MB OTA partitioning scheme released for/with firmware version 3.3.006.

For modules still running the old partitioning scheme, the last available 4MB builds
are kept available under .../v3.x/... (instead of .../v3.x-5/...).

We recommend to upgrade the partitioning (module web UI, Config -> Partitioning).