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Bitlocker and Win10

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I have two partitions with Bitlocker and Win10. The image is on the 2nd partition, which is unlocked automatically if I am in Win10 logged in. How can I give True Image access to recover the image?

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Einar, welcome to these public User Forums.

If I understand your question correctly, you have encrypted both your two partitions with BitLocker and are backing up Windows 10 on one partition to a destination which is on the other partition.

You will need to create the Custom MVP version of the Windows PE rescue media and inject support for BitLocker into this media using the option provided, then after booting your computer from the rescue media, unlock the BitLocker partition from a command prompt window before you will be able to recover your backup image from the partition.

See link in my signature for the Custom MVP media tool.

I now have made everything as you said, and added bitlocker support, but there is no command prompt window if I boot the new USB drive. The file explorer on this system does not show any files in the locked partition(s). 

Einar, if you have created the MVP Custom WinPE media then you should be seeing something very similar to the image shown below, where there is an icon for a command prompt shown in the system tray area.

Einar, the simplest method of unlocking your BitLocker partition once you are booted from the rescue media and have a command prompt window open, is to use a small .BAT command file with commands similar to those shown below:

BitLockerUnlock.BAT

D:\>manage-bde -unlock L: -rp 629178-109406-442673-302522-707971-185559-182171-355575
BitLocker Drive Encryption: Configuration Tool version 10.0.17763
Copyright (C) 2013 Microsoft Corporation. All rights reserved.

The password successfully unlocked volume L:.

You would need to enter your own unlock password key in place of the key shown above for the -rp value - this should be found in the key value from when you encrypted the partition.

If you don't know the key value, then you should be able to generate it from the BitLocker Control Panel in Windows using the 'Back up your recovery key' option for the partition.

I believe there is still a bug in the rescue media (going back to at least 2018) that unlocking the disk offline with rescue media, is still not properly being picked up by the True Image Application. Last I heard was it was supposed to be fixed in the 2020 update 1, but it is still not working for me.  I have issue "unlocking" the bitlocker disk with manage-bde offline, but True Image still seems to think it is locked and won't proceed to backup.

Using a script to unlock is great and simplifies things.  However, if you want to go the manual route, it is all command prompt and you just need to enter your bitlocker key with the correct command.  There are many examples online, such as:

https://www.top-password.com/blog/decrypt-bitlocker-encrypted-drive-from-command-line/