Nexus 6 Questions

For several days he chases the voice of an imaginary Qfuse, an “electronic fuse”, which theNexus 6 p and Nexus 5 x would be used by Google to store permanently unlocking thebootloader.

The news has become increasingly exaggerated and has conditioned the same call center that in some chat published by forum USA, through its employees, he hurriedly confirmed this.For some time we had anticipated that with Android 6.0 Marshmallow Google would further enhanced the Verified Boot, giving the feeling of wanting to restrict freedom heretofore granted to developers of Custom ROMs, but the Qfuse is another story and no impact on the loss of warranty or the inability to use Android Pay.

Much of Qualcomm’s security architecture is implemented using the QFuses (QFPROM), which are similar to fuses software and are programmable to configure device settings and encryption (or hash keys). Because of their nature, once the QFuse is burned, you cannot restore the original value. Read InternetDict for more questions and answers.

When the QFuse is “enabled”, such as in all production devices from Motorola, each stage of the boot chain is cryptographically verified to allow it to run only signed bootloader. In particular the PBL (“primary” Bootloader) check the integrity of the SBL1 (“secondary Bootloader”) through a SHA1 hash. Each stage of the boot chain check the next stage using RSA signatures. Secure boot (S-On on HTC phones) takes care of checking as part of this chain is not eventually signed with the right key blocking the Rom startup procedure.

As can be seen from these two images both in the case of a device locked and unlocked the Qfuse is enable (active).

It is clear that only means that factory is active Qfuse enabled secure boot and, therefore, the smartphone will verify that all components (boot, modem, etc.) we have the same signature.

In summary, then, the Qfuse enabled has nothing to do with unlocking the bootloader, but warns that the Secure Boot is enabled and therefore the bootloader must be signed. When you type the command “fastboot oem unlock” you can use a boot.img not signed although it is required a signed bootloader.

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