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Search for the latest RM-645 firmware package (v102.002 or higher is usually the final version).
If your phone shows no signs of life (no vibration, no LED), you may have a condition. Here’s the rescue method: nokia rm 645 flash file
Often cited as one of the latest official releases for this model. Search for the latest RM-645 firmware package (v102
If you press the power button and the phone does not respond at all—no lights, no vibration, no screen—it is considered "dead." If this is caused by software corruption (corrupt bootloader) rather than hardware damage (dead battery or broken motherboard), flashing the RM 645 firmware can revive it. nokia rm 645 flash file