I purchased the cpu from microcenter, the upgrade was performed on the base $1799 model with the following firmware.
Boot ROM Version: IM131.010A.B04
SMC Version (system): 2.11f14
Post your friend Boot/SMC version if possible.
Why upgrade the CPU on that Mac when the GPU is totally sub par for a 27inch screen? You would be better of getting the $1999 machine...the .3 i5 increase along with 675mx would make more sense...