If you ever consider modding your Galaxy Note 20 or Note 20 Ultra, you'll need to know about recovery mode and download mode. Even if that isn't your thing, knowing how to how to boot into these modes can help save your phone from a soft brick. Without the dedicated Bixby button, booting into either mode may not seem as straightforward for longtime Galaxy users. Thankfully, Samsung made the process easier, removing the need to rely on holding three buttons with enough pressure and time to boot into the correct mode.
To boot into recovery mode, start by turning off your Galaxy Note If you watch all the way through me doing this USB method, you see how it is different than the other.
I own the regular Galaxy S21 and demonstrate this all working in the video above. But Samsung keeps things pretty uniform across the same series of devices. So yes, I can confidently say this entire process that includes both methods listed above will work on both the Samsung Galaxy S21 as well as the Samsung Galaxy S21 Ultra. Thankfully, Samsung keeps text up on the screen no matter which method you go with that tells you how.
Samsung says it will take more than 7 seconds of holding these two buttons down. But once the OS detects you have done it, the phone will power off and instantly start the boot process again. In its place is what the community tends to call Download Mode. Save my name, email, and website in this browser for the next time I comment. They are mostly implemented like traditional apps, with the following differences:. Functionality available includes:. Testing should be conducted manually or with unit tests for the demo application.
This implementation was removed in Android 8. Figure 1. Retail demonstration mode option in Language selection. Retail employees can enable retail mode directly from the first screen of any setup wizard by selecting the language Retail demo at the bottom of the list. This option is available for new devices shipped fresh from the factory. Once a consumer setup has completed, retail mode may no longer be available. Once selected, the device finishes SUW with an abbreviated flow. Figure 2.
When the device enters retail mode, it switches to a new demo user and automatically starts the custom launcher specified in the overlay resource described under Implementation. By default, this custom launcher plays the demo video on repeat until the user touches the screen to begin a guest session. At that time, the custom launcher starts the system launcher and then exits. OEMs can alter the custom launcher to additionally launch another service or activity on exit.
See the Implementation section for details. In order to maintain the integrity of retail mode, keyguard is disabled and certain actions from Quick Settings that could adversely affect retail mode are also disallowed, including:. Additionally, access is also blocked to some global settings that can affect retail mode by disabling:. If the user is idle for some period of time 90 seconds by default , retail mode will show a system dialog to prompt the user to either exit the session or continue.
If someone turns off the screen using the power button, it comes back on automatically after a few seconds. After exiting a demo session, devices mute themselves and reset some global settings, including:.
In order to exit retail mode, retail employees must factory reset the device from the boot loader. Setup wizard sets a Global setting Global. Upon seeing this setting, RetailDemoModeService creates and switches to demo user when user 0 is started, enables the custom launcher specified in an overlay resource, and disables SUW. System Server and SystemUI also use this flag to manage aspects of retail mode.
When the user touches the screen, the custom launcher disables its activity component, which results in the default system launcher starting up. The custom launcher must have its custom component marked as disabled by default so that it doesn't show up in non-demo scenarios. Setup wizard also looks for the above video to provide an affordance to enter retail mode. SUW can be modified to look for some other OEM-specific sign that retail mode is supported if the video is not a part of the demo. To set retail mode-specific settings, use: Settings.
Note: milliseconds is the current timeout default but is configurable. This feature places sample photos in a special folder that is visible to any gallery app.
The photos are available only in demo mode and cannot be modified by the demo user as they are in a protected directory. With this restriction, AccountManager and Settings do not allow the addition of accounts. Some Google apps react to this restriction and show an error message, and others will not prompt for an account such as YouTube and Photos. But this is a general problem not unique to retail mode. It is likely already solved for enterprise use cases.
OEMs are free to choose their layout but should include apps that function well on the home screen and hotseat. Built-in apps may have their experience for retail demo mode customized by calling the API UserManager.
Demonstration videos should be in portrait layout or natural orientation of the device, if tablet and can be any length greater than five seconds.
By default, when retail mode is enabled, device policy is set to over-the-air OTA update automatically. Retail devices will download, reboot, and install the update respecting battery thresholds without confirmation even if it is marked as optional. So any subsequent factory reset will result in an inability to go back into retail mode. The URL to download the video from can be configured by overriding the following string value in the RetailDemo app:.
For example, if different videos need to be used in the U. This video will be downloaded at most once per every device reboot.
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