Troubleshoot your device showing an exclamation mark on a black screen on Android.
This screen is called recovery mode, and is usually accessed from the bootloader menu on an Android device. Learn more about this mode, and get steps to get your device back to normal here.
Pressing or holding certain buttons during boot up will bring up this menu, where your device provides options to help repair or install operating systems. Most Android devices use the Volume Up and Volume Down keys to navigate through the bootloader and recovery mode. The Power key is usually used to select options.
Note: The most common cause of issues with recovery mode is a rooted device, or having installed a custom ROM. In this case, T-Mobile does not provide any support for rooted devices and you will need to refer to the device manufacturer for additional troubleshooting.
Note: These steps work with most Android devices, but not all. Manufacturers customize the bootloader and recovery mode of their phones. If these steps do not work, contact the manufacturer.
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