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After update into Slot into B, is there any way to mirror the contents of B back to slot A? So that both slots have the same versions.

How do copy complete updated slot B back to slot A efficiently?

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I have had to do this while installing Lineage OS on my Moto X4. You can find the "copy partitions" ZIP file on the official installation site here:

Pre-install instructions

In some cases slot b can be unpopulated or contain much older firmware than slot a, leading to various issues including a potential hard-brick. We can ensure none of that will happen by copying the contents of slot a to slot b. This step is NOT optional.

To do this, sideload the copy-partitions-20210323_1922.zip package by doing the following:

  1. Download the copy-partitions-20210323_1922.zip file from here.
  2. Sideload the copy-partitions-20210323_1922.zip package:
    • On the device, select “Advanced”, “ADB Sideload”, then swipe to begin sideload
    • On the host machine, sideload the package using: adb sideload copy-partitions-20210323_1922.zip
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    Any clue how does copy-partitions-20210323_1922.zip works, like what it contains what special thing it contains it copies slot A to slot B ?
    – Amruth A
    May 3, 2021 at 6:20

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