INSTRUCTIONS:
Requires an unlocked bootloader (a.k.a. qualcomm development bootloader).
Easy to check: Turn the phone OFF, then press and hold VOLUME UP + POWER until you notice a short vibration. Plug in to the computer. If the phone turns up in disk mode (USB Mass Storage Device), then you have an unlocked bootloader. IF you're in Windows, it will ask if you want to format the disk. SAY NO OR IT WILL EXPLODE (it won't explode but you might break it)
If the device detected by the computer is Nokia DLOAD you have a locked bootloader and you're out of luck, at least for now.
hard reset is required after any custom firmware, otherwise phone just will not work
Then can not continue.