IMPORTANT NOTE:
To upgrade the DTM-3200 to firmware version v2.5, the DTM-3200 must contain
firmware version v2.0. When your DTM-3200 contains a firmware version prior
to v2.0, you first have to upgrade to firmware version v2.0, and after that
you can upgrade from v2.0 to v2.5.

The two-step approach is required because of the introduction of compressed
firmware, to speed up firmware upgrades considerably. Firmware version v2.1
is the first firmware that is distibuted in compressed form, while firmware
version v2.0 is the first firmware version that supports firmware upgrading
using a compressed firmware file.
 
For details about the firmware changes in V2.5 and V2.0 please refer to the
manual in "DTM-3200 Manual.pdf"