  Hi. Unfortunately this isn't possible since the BIOS update is a Windows executable file. How it actually installs it itself I'm not sure, but I've always either just used the exe file or via the Dell update software. Try Method 1 from = Updating the BIOS on Dell Systems With BitLocker Enabled
Dell Inspiron 7591 The Dell Update app notified me of a few updates one of which was a BIOS update, but this update is blanked out in the Dell update app. So I downloaded it via the Dell website but after running the update it will not install, it complains: "Warning: MS Windows Bitlocker drive encryption/decryption is currently in progress. A firmware update is not possible at this time. Please try again later once this process is complete." I have a separate data drive which is encrypted with Bitlocker, it does not make a difference weather it is locked or unlocked, the Dell update still complains either way and will not continue the update. I think about turning Bitlocker off on the drive but that involves decrypting the 1TB drive which would take a lifetime. This is stupid, apparently is fixes 4 security vulnerabilities yet I can't apply the update. Is there any options?
Cant update BIOS because of Bitlocker