Report BitLocker Task Sequence Error - "The context blob is invalid" (0x8028005A) in System Center Configuration Manager (Current Branch) Posted January 26, 2017 The E5450 task sequence appears to be going through fine now after making a couple of minor changes.We use Dell's CCTK (Dell Command Configure) to programmatically Enable and Activate the TPM during the task sequence before enabling BitLocker.The task sequence is configured to Enable the TPM (turn it on) > Restart Computer > prepare CCTK files/drivers > sleep for 2 minutes to allow the TPM to initialize > Activate TPM. Those steps work fine for all other models we've seen apart from the E5450s.To fix the E5450s, we use a WMI query so that the reboot steps are ignored for that model. To do this, we created a new group and moved the Restart Computer, prepare CCTK files/drivers, and sleep for 2 minutes into it. We have a WMI query on the group to only run those steps if the hardware model is not a Latitude E5450: "Select * from Win32_ComputerSystem where not Model like 'Latitude E5450%'".We also have a reboot directly before the Enable BitLocker step. To make sure the system and TPM has time to initialize after the boot, we added a 60 second sleep directly before the Enable BitLocker step: "powershell.exe -command start-sleep 60".Hopefully we don't see any more strangeness with this model!