Download Mode

A Download Mode is a way to flash a Phone,Tablet, and Watch. Its used to flash a custom ROM or update a device. Its also used to recover a bricked phone or tablet.

Ways
There is 2 ways to enter download mode: Via Buttons or USB Jig. To do it in Samsung Phones hold Power + Vol Up + Vol Down. If you have a phone with a Bixby button hold Power + Vol Down + Bixby. If you have a phone with a physical home button hold Power + Vol Down + Home button. The last way to enter download mode is via USB Jig. Simply plug your USB Jig into your phone and wait a few seconds. To do it in LG Phones, Watchs hold Vol Up and plug your USB into your PC while holding Vol Up. For watchs Put your LG Watch into your Charger dock and when you see LG Logo swipe from bottom left to top right.

Exiting Download Mode

For LG Phones, Watches Hold Power + Vol Down for long. For LG Watches simply disconnect the device from the Charging Dock. Another way to exit this is by disconnecting the battery. Make sure the USB is disconnected before disconnecting the battery.

For Samsung Phones hold all the buttons or disconnect the battery.

Disclamer
Be sure not to disconnect or REMOVE the battery during the flashing process. This Android wiki has NO WAY responsible if you brick/damaged your phone,watch