This is pretty normal, they don't want to erode sales of what they
call 'enterprise' devices.
Was IE stated as a requirement? If not, you probably have good
grounds to return it.
Most of this class of switch (i.e. low-cost gigabit, intended to
be managed by a web browser) seem to use Marvell or Broadcom chips,
neither company are renowned for freely available programming
information. That's even before you start on the ASICs.