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You have taken note of your current build number. Knowing your current build number makes it easy to revert to the most compatible firmware in case you flash a buggy or incompatible firmware.
The battery is charged to an extent and inserted into the phone
The phone is powered off / switched off
You have installed
You have downloaded either part of or the complete firmware above (depending on what you need to flash) and unzipped it into a folder.
You have a PC and a USB cord.
You know the boot key for your device (usually the volume down or volume up button)