It seems that upgrade to 1.10.1 fails if an external display is connected via HDMI or DisplayPort, either directly to computer or via dock, and the external display is active. If external display is connected but the lid on the laptop is open and the external monitor is inactive, the upgrade works fine.
On 800 Latitude 5400 I did an update to Bios 1.10.1. Mainly from version 1.9.1. 40 so far did not start anymore after Bios update. First time I see this problem. I did a few earlier updates on them without issues. Don't know what is going on.A Bios update history of one of the computer. It was working fine until update to 1.10.1: 1.3.11|1.5.1|1.6.3|1.9.1|1.10.1|   The fix is to remove TPM from battery, remove battery, wait 10 seconds.After boot to Bios and change settings according like UEFI, TPM, secure boot, AHCI, etc.
Dell Latitude 5400 not starting anymore after BIOS update to 1.10.1