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Tinkering with small devices

Dell Wyse 3040 (F1 retry boot, F2 setup utility (BIOS), F5 onboard diagnostics, F12 Boot menu)
HP t640
Intel NUC NUC7I5BNB (F2 BIOS, F7 BIOS update, F10 Boot menu)
Intel NUC D54250WYB (F2 BIOS, F7 BIOS update, F10 Boot menu)

BIOS update for Dell laptops without battery

Tested with Dell Precision 5530

Download respective *.exe file from Dell pages
Copy the *.exe file to root of a FAT32 formatted thumbdrive
Restart laptop into F12 boot menu, select BIOS Flash Update
Select *.exe file
In options field type /forceit
Start BIOS update

Source

reddit: Update BIOS without battery?