Here is a link to the downloads available for your Compute Stick: Downloads for Intel® Compute Stick STCK1A32WFC. Hint: I found this page by going to Download Center main page (here: Drivers & Software) and searching for "FC" ("FC" is an acronym for this model's code name, Forest Canyon).
As you can see, the latest BIOS release (Build 35) is included in the list of downloads available. Here is a link directly to the BIOS download page: Download BIOS Update [FCBYT10H.86A]. You can download an executable that initiates the BIOS installation process from within Windows. My preferred method, however, is to download the .BIO file (in this case, FC0035.BIO) onto a USB flash disk and then use the F7 key during BIOS POST to initiate the file selection and installation process.
Hope this helps,