1. How to Downgrade a PSP.
http://www.wikihow.com/Downgrade-a-PSP
2. Android: Verified boot.
https://source.android.com/security/verifiedboot/
3. Apple: iOS Security. Technical report Apple, p. 5 (2015)
4. ARM Security Technology: Security technology - building a secure system using trustzone technology (2009)
5. Challener, D., Arthur, W.: A Practical Guide to TpPM 2.0: Using the Trusted Platform Module in the New Age of Security. Apress, New York (2015)