Name: Forensics acquisition - Analysis and circumvention of samsung secure boot enforced common criteria mode
Link: https://www.sciencedirect.com/science/article/pii/S1742287618300409
License: CC BY-NC-ND
While this paper directly applies to the Galaxy S6 (SM-G920F) and the Galaxy S7 Edge (SM-G935F) witch uses Exynos System On a Chip, some of its findings seem to be directly applicable to the devices supported by Replicant.
The most interesting part is the analysis of some of the bootloader environment variables: