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[title] Reboot to the bootloader, or reboot in Safe Mode
[* icon_note] All steps in this guide will vary from one phone model to another. Read your device's documentation to determine the specific steps required.
[* black] To power down most phones, hold down the power button until a prompt appears. Tap on the pop-up message. Some devices may have a "Power off" command in the software settings.
[* red] If'''If your phone is crashing or locking up after boot, try rebooting into ''safe mode''. In the previous step, tap and hold on "Power off" until the prompt changes to "Reboot to safe mode." Tap OK.OK.'''''''''bold text'''''''''bold text'''''''''bold text'''''''''bold text'''''''''bold text''''''bold text''''''''''''''''''
[* red] If'''If your phone is crashing or locking up after boot, try rebooting into ''safe mode''. In the previous step, tap and hold on "Power off" until the prompt changes to "Reboot to safe mode." Tap OK.OK.'''''''''bold text'''''''''bold text'''''''''bold text'''''''''bold text'''''''''bold text''''''bold text''''''''''''''''''
[* icon_note] Most third party apps will not run under ''safe mode''. If the phone runs okay, then reboot normally and start uninstalling apps until you determine which one was the culprit.
[* icon_caution] Some apps' settings will be lost or reset after using ''safe mode.'' You may have to set them up again.
[* black] With the phone in an off state, hold down buttons in a combination to enter the bootloader. Google Nexus models [https://source.android.com/source/running.html#booting-into-fastboot-mode|have specific combinations] like holding ''Volume Down'' and ''Power'' simultaneously.
[* blue] Your device's bootloader may look different from this Nexus 5 screen. That's okay. Note the essential information available to you here: phone model, product variant, serial/[https://en.wikipedia.org/wiki/International_Mobile_Station_Equipment_Identity|IMEI number], [https://en.wikipedia.org/wiki/Subscriber_identity_module|SIM] and bootloader locked state.