Same problem with me
So custom rom can be used with a properly signed vbmeta with chained partitions and boot process should be allowed in this case (vbmeta isn't signed by OEM so doesn't have key in PBL but have another sign from user), in the other side secure boot eFuse provided by Qualcomm in SoCs will check the integrity of vbmeta with the OEM key in PBL which burned in the SoC and will refuse to boot if it doesn't match.. as far as I know even on Unlocked bootloader PBL will check integrity of XBL and refuse to boot if not match.. so can custom rom with vbmeta signed by a user boot on locked devices or not?If the device is LOCKED, only an OS signed by an embedded verification key (see the previous section) shall be accepted. Additionally, rollback_index[n] as stored in the verified image must be greater or equal than what's in stored_rollback_index[n] on the device (for all n) and the stored_rollback_index[n] array is expected to be updated as specified in the previous section.
- If the key used for verification was set by the end user, and the device has a screen, it must show a warning with the key fingerprint to convey that the device is booting a custom OS. The warning must be shown for at least 10 seconds before the boot process continues. If the device does not have a screen, other ways must be used to convey that the device is booting a custom OS (lightbars, LEDs, etc.).
* Your warranty is now void. * We are not responsible for anything that may happen to your phone by installing any custom ROMs and/or kernels. * You do it at your own risk and take the responsibility upon yourself and you are not to blame us or XDA and its respected developers.
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