If the bios doesn't work try to recover your bios from the Configuration Menu following this steps:
1. Prepare USB stick formatted to FAT32 with Bios file RY0367.bio
2. Disconnect the power adapter and remove the bottom cover from your NUC.
3. Remove the yellow security jumper (see Product Technical Spec, para. 2.3, page 49: https://www.intel.com/content/dam/support/us/en/documents/boardsandkits/NUC5i5RYB_NUC5i3RYB_TechProdSpec.pdf ) and close the bottom cover.
4. Reconnect the power adapter and power ON the NUC. Wait 30 sec - 2min. If the memory, cable and monitor are working you shall see the Configuration Menu - similar to the attached image.
5 If you see this menu, NOW insert USB stick (prepared before) with the latest bios file - RY0367.bio
6. Press '2' to clear all passwoards
7. Press F4 and the bios recovery will start after short time and will end after 2 -5 minutes.
8. When bios recovery completed, switch the power OFF, remove the power adapter and replace the security jumper (between pins 1-2).
Hope this will help
ConfigurationMenu.jpg 54.4 K
Unfortunately I've already tried this; the issue is that, in all other respects, the BIOS functions - NUC boots, runs the OS. It's only that, via some HDMI systems, that used to work, it's not possible to access the VisualBIOS functions via F2. There's no need for me to re-flash it as the update itself was successful.
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Sorry David, you're wrong. Sadly, the fact that a BIOS flash appears to be successful does not mean that everything is ok. Follow Leon's suggested process and do a BIOS Recovery. After the BIOS Recovery, I have additional steps for you to perform:
9. In subsequent POST, use F2 to enter BIOS Setup.
10. Press F9 (followed by Y) to reset the BIOS Configuration.
11. Press F10 (followed by Y) to save configuration and exit BIOS Setup.
12. In subsequent POST, again use F2 to enter BIOS Setup.
13. Make any BIOS Configuration changes you absolutely require (SATA Mode, Boot Order, etc.).
14. Press F10 (followed by Y) to save configuration and exit BIOS Setup.
Follow these additional steps exactly; do not try to combine the BIOS Setup invocations; they are this way for good reason.
Hope this helps,