All Android phones go with a built-in recovery mode which separates from the original operating system. Android Recovery Mode is a feature of Android devices used to access different features of the phone without accessing the phone's OS. You don't need to install any program on your phone or connect to other devices. The main function of booting in Android recovery mode is to fix the phone while staying away from the faulty OS of the phone.
The process to get Android phone into recovery mode can vary from device to device. Generally, shut down Android and make sure it unplugged to the charge. Then make your Android Power off and access this mode via keys combination. The following shows how to enter recovery mode of several popular Android phone series.
If you see a menu instead, then navigate (like mentioned above) to "Recovery mode" option and press power button to enter.
When you enter the recovery surface of Android mobile phone, the arrow keys can control movement as you can see.
The options available in recovery mode include reboot system now, apply update from ADB, apply update from external storage, wipe data/factory reset, wipe cache partition, apply update from cache.
This is a plain reboot. Your Android will power off and then reboot into the commend interface. When you have completed the recovery mode, you can select it.
Using Android Debug Bridge (ADB), you can connect your phone to PC and provide commands right from your PC. This feature is mostly used by developers to fix bugs in applications. Of course you can use computer to send and install update onto your phone by connecting Android and computer. This could be pretty rarely used for person but if you ever need to use this tool you can often find step-by-step instructions by performing a quick search online.
Using phone memory card can be the bridge of computer and Android phone. You can download something you want to and reinsert the memory card to mobile phone. But how to update information of your memory card to enable Android device to detected the new content of it? This time you can use this function-apply update from external storage. When you click this option, Android phone will discover the new data.
When you want to sell or throw away your old phone, wipe data/factory reset can clear up all the data in your phone and it'll be secret and safe. If your phone are locked out or can't access the OS, you can use this function to reset your phone and start over. But this action will delete all your data, so make sure your phone data is backed up before you reset it. You can refer to Tenorshare Android Data Recovery to retrieve your data if you lost your phone file occasionally.
Android cache we used can tend to pile up, and some of these that can add up over time run in the background of the device and we don't even know it! These are temporary files used in application installation mostly. Performing a wipe cache partition clears out some of this temporary data can help prevent troublesome issues because they can sometime make the phone not work properly. Hence you can wipe them from "Recovery mode" and it won't remove or erase any personal information or user data from the device.
Applying update from cache will download the update file to your phone. The update file can be downloaded using an internet connection provided by either your mobile data or a Wi-Fi connection. After the update file is in your cache folder, you should shut off your phone, boot into the Android Recovery Mode screen, highlight and select the "apply update from cache" option. By the way, you may have to manually select the update file you want to apply, once selected the update should begin.
As you can see, Android recovery mode shows you these fabulous functions which you may not go into. Enter recovery mode on rooted, locked Android devices and perform your phone better!