How to check and fix Android Boot Problems

How to check and fix Android Boot Problems

What are the Android Tools for Recovery?

Here are the list

    Android Safe Mode
    Battery pull
    Soft and hard reboots
    Bootloader (or recovery) factory reset
    Bootloader (or recovery) cache wipe
    Software recovery toolkit
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How to Use an Android Bootloader?

A bootloader enables users to load different bootable portions (or partitions) of their operating system. It allows users to select between booting a recovery partition or their operating system. When the operating system cannot boot, the bootloader can restore the original factory-fresh operating system.

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Factory Reset an Unbootable Android Device
Usually you just turn of the device then press and hold power and volume down.
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Bootloader Access Variations

Power + volume up
Power + volume down
Power + volume up + volume down

How to Perform a Hard  on Android?

A hard reset restores the operating system back to its original, factory-fresh state. Performing a hard reset requires entering the Android bootloader (or recovery).

To do this just power off the device. Then hold down the power and volume down buttons until the bootloader displays. Then choose any option that sounds like a Factory Reset.