Phillip Corcoran said:
There's no single answer "yes" or "no" because it depends on the actual motherboard make & model. Some board manufacturer's have posted BIOS updates to support Haswell Refresh, some haven't gotten round to it yet. That's no doubt why you are "hearing conflicting stories".
As to your first question about whether or not it's possible to update the BIOS with an unsupported CPU installed, again depends on the board model, but in most cases it can't be done - - you need to fit a supported CPU then install the Haswell afterwards. Okay for CPU upgraders, not so good for those building a new system from scratch.
Thanks for the response...selected as best solution.