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The custom ones are those that are not the ones officially developed for the device, but that made for interested people only.Īs you may already know, for every obstacle in Android there is a solution. To give an example, with the Galaxy J7 bootloader will only load the versions of Android that Samsung has developed for the device.Ī ROM is an operating system build that runs on your device with essential applications such as calendar, calendar, camera, etc. Almost all smartphone manufacturers decide to block the bootloader of their devices, only allowing them to load their versions of Android, and preventing the installation of any other custom ROMs. When you want to modify an Android device, one of the biggest obstacles is the locked bootloader.Ī locked bootloader will load only authorized operating systems with a signed digital signature. The bootloader is developed and provided directly by the device manufacturer and, given its importance, is located in a memory location that can not be easily modified by users. Through Recovery Mode it is possible to clear the cache or restore the factory data without having to start (a useful solution if your device has stopped responding to commands). It is the bootloader that will determine when to run Android or when it enters into Recovery Mode, the operating environment independent of the operating system located in another partition of the internal memory. The same principle also applies to Android devices, except that in this case, the operating system in question is only one.