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The way to Test if You’re on Partition Slot A or Slot B?

With the creation of Android 8.0, Google incorporated a brand new partition machine for the working machine. As an alternative of getting one set of walls for the OS, the OEM may just enforce 2. It may be very helpful to grasp if partition slot A or slot B is lately lively and you’ll be able to learn to take a look at by means of the usage of this Fastboot command.

So while you obtain an OTA replace, the brand new firmware for a smartphone with this twin partition scheme is in truth being put in to the other partition than you’re lately on. So, for those who’re on partition slot A then the replace might be put in to Slot B (and vice versa).

There are each positives and negatives that flatter an OEM imposing this partition machine.

The unfavorable is that the OS now takes up two times as a lot house because it did prior to. This calls for OEMs to extend the interior garage capability so the consumer (in the end) has an identical quantity of usable house. This additionally drives up the associated fee and necessarily prevents those low-end telephones with 8GB of garage not to enforce the characteristic.

There are a variety of certain causes for an OEM to make use of the program even though. Originally, the updates set up within the background so that you don’t have to sit down at an ‘Putting in New Replace’ display screen for 30+ mins. Those updates can also be downloaded and put in although your usable inside garage is complete.

It could additionally assist you to temporarily ‘rollback’ to a prior replace if you happen to’re now not keen on the brand new one, or ran right into a bootloop.

You most likely already know in case your software lately helps the A/B partition machine or now not. After all, I’ll almost certainly do an academic about that at some point I’ve created the educational to take a look at and notice in case your software helps the A/B partition slot setup (and Android’s Seamless Gadget Updates).

As soon as you determine in case your software helps it, you’ll be able to practice this information to test and notice what your lively partition slot is.


With a purpose to entire the educational beneath, you are going to want some issues arrange forward of time. Please practice the how one can set up ADB and Fastboot equipment information if you have not executed so already. Then it is very important practice the how one can permit Developer Mode information, in addition to the educational that displays you how one can permit USB Debugging Mode.

You’re going to then want to open a command instructed throughout the inside of the similar folder as your ADB and Fastboot equipment and execute the “adb gadgets” command (with out quotes) to start out the ADB provider. Then attach the software to the PC with a USB cable and also you must see the instructed to grant USB Debugging Mode get entry to from the PC the telephone is attached to.

As soon as granted, you’ll be able to then check this by means of working the command “adb gadgets” once more (with out quotes) in a command instructed or PowerShell to verify the pc acknowledges the software.


Time wanted: 10 mins.

The way to Test if Partition Slot A or Slot B is Lately Energetic?

  1. Make certain the smartphone is attached to the PC with a USB cable
  2. Now boot the smartphone into Fastboot Mode

    This procedure will range from software to software however generally comes to maintaining positive button(s) down all through the boot cycle.

  3. Open up a Command Steered, Home windows PowerShell, or a Terminal in the similar folder as your ADB and Fastboot information
  4. Kind out the next command. . .
  5. fastboot getvar all
  6. . . .then press Input at the keyboard
  7. Look ahead to a large number of textual content to complete scrolling and search for the (bootloader) current-slot textual content

    This must in truth be towards the ground with out the want to scroll up.

  8. The letter after this newsletter would be the lately lively partition slot to your software

    check active partition slot

    check active partition slot

    On this example, my software was once lately the usage of partition slot B.

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So, so long as you’re semi-comfortable with the command instructed you then gained’t have any troubles right here in any respect. For absolute newcomers, lots of the paintings you’ll be doing is putting in ADB and Fastboot equipment. I like to recommend the usage of the Minimum ADB & Fastboot installer because it creates a very simple to make use of desktop shortcut for launching a Command Steered.

For individuals who are extra completely happy, you’ll be able to obtain and extract Google’s fundamental toolset if you need.

Both manner, the function is to get a Command Steered, Home windows PowerShell, or a Terminal open and in the similar listing as your ADB and Fastboot information. With that executed, you merely want to execute that fastboot getvar all command and also you’re executed. From there, simply search for the current-slot access and that’s your solution.

It’s going to both say current-slot:a or current-slot:b. If it lists slot A then that’s the slot which is lately lively. You’re going to keep in slot A till you both set up an OTA replace (and reboot) otherwise you manually trade the lately lively slot with a Fastboot command. I’ll duvet this in a long run educational as neatly.

Additionally, if in case you have TWRP put in then you’ll be able to simply boot into Restoration Mode and take a look at within the Reboot segment.


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