Bios modded, but how to flash it? Lenovo s410p

Hi,

I modified the BIOS image file of my Lenovo s410p using PhoenixTool v2.56 (altered the WLAN whitelist) and now I want to flash it.. but how? (Insyde BIOS)
You would think that I completed the hardest part but I'm having far more difficulty finding the right flash tool... already went through a number of them without any success. How do I know which flash tool to use? Any recommendation?
There's no (official) BIOS update available for the Lenovo s410p, otherwise I would know exactly what tool to use and use that to flash my image.

Thanks!