Problems with locked cpu multiplier

Hey guys...today i upgraded my windows 7 to windows 8..noticed cpu running at stock speed...so i went to bios to overclock again...aand noticed i cant change core multiplier...whatever i write after pressing enter or moving it returns to 38...updated bios back to 1.3 1.2 then again to 1.4 and all the same...last time i had same issues with windows 7 and bios 1.0..so i just upgraded to 1.40 and it worked...also tried removing cmos battery... Any suggestions guys? Or its just bad motherboard?
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More about problems locked multiplier
  1. Forgot to mention..i5 3570k and asrock z77 extreme4-m
  2. this may sound stupid, but instead of hitting enter after inputting a desired number in the bios, try hitting F10.
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