For my opinion, you need to explain more detailed procedure to make your flash good.
Otherwise is very difficult to answer or get an opinion for you problem.
Remember is always better to restart JF or OS and re-power re-plug sata I/O if you see device intro falied. But may depends of many type of hardware config, for example after device intro falied, for ME on a win seven ultimate 32, fresh install on asus pk5pl-am , just need to:
* close JF 1.81
* power off dvd drive
* unplug I/O (wait few [5-10] seconds)
* replug I/O
* repower dvd drive
* open JF
Works and unlock spi with no prob! on Native ich7 sata controller!
JF tutorials is updated , but you take a look on it?
Some people hard work on it, if read all on tut. doc., then probably found all answer you need.
Regards.