Hello Zubenub1, I’m sorry to hear that you are having this kind of issue with your NUC, however there is a possible solution of this.
We do get occasional reports of problems entering BIOS with F2. Usually it comes down to the type of HDMI monitor you're connected to.
Also, this behavior could be caused when we use any kind of device along with your HDMI connection (like an AV receiver or an adapter). If you are using one, you can try without that device - just connect directly from the NUC to the monitor and see if that helps
Since you have BIOS version 0021 installed, we can try updating the BIOS first since there is a fix related to this issue on BIOS v0026. Please install BIOS version 0023 or 0024 before installing BIOS 0026.
- V0023https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23563
- V0024 https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23607
- V0026 https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23926
Regards,