There is an official .EFI updater available for 3.19 (Link: 11th Gen Intel Core BIOS 3.19 release). You can find the appropriate instructions in the post. Note that the .EFI updater is in BETA so you use it at your own risk. The .EFI updater wasn’t initially available and in the comments, some individuals were trying a workaround which seems to work but has its associated risks. However, that isn’t necessary anymore. You should be able to directly upgrade to 3.19 from 3.9. If it doesn’t work, you may need to go to 3.17 then 3.19.