From 2dcc6ea4ff393af4ce97a1796877ba311dc6bd04 Mon Sep 17 00:00:00 2001
From: Daniel Micay
adb sideload blueline-ota_update-2019.07.01.21.zip+
You do not need to have adb enabled within the OS or the host's ADB key + whitelisted within the OS to sideload an update to recovery. Recovery mode does not + trust the attached computer and this can be considered a production feature. Trusting + a computer with ADB access within the OS is much different and exposes the device to a + huge amount of attack surface and control by the trusted computer.
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