3Com 4007 Release Note page 113

Upgrading Multilayer Switching Modules From 2.1 to 3.0.5 113
Note 3: If Fast Ethernet or Gigabit Ethernet trunks are configured in
Release 2.x, the requested flow control value in the displays may appear
incorrectly after you upgrade to Release 3.0.5. This has no impact on
traffic flow through the device.
Note 4: Before you connect to a multilayer switching module to the
network, reset the SAPadvertising parameter to its Release 2.x value.
7 Update the Emergency Download parameters for the module, if
necessary. See "Updating Emergency Download Parameters" later in this
chapter.