The bios version is 2.2.23
That's not a BIOS version number; that's just the version of the Visual BIOS GUI - which is likely present in multiple BIOS releases. The most-recent BIOS version is 359 (full string: RYBDWi35.86A.0359.2016.0906.1028).
What I suggest that you do is install (or reinstall, as the case may be) BIOS 359 using the Recovery Method. That is, download file RY0359.BIO, place it in the root folder of a (I recommend freshly-formatted using FAT32 file system and done from another Windows (i.e. not Linux and not MAC) PC) USB flash disk and then follow the instructions here: BIOS Recovery Update Instructions for Intel® NUC.
Hope this helps,