Here are the steps to flash your Nokia RM-645:
Flashing will erase all data. Back up your files if the phone is still functional. nokia rm 645 flash file
There are several reasons why you may need to flash your Nokia RM 645: Here are the steps to flash your Nokia
Before downloading, identify which firmware version you currently have (check via Settings > About Phone if possible). The most common RM 645 flash file versions include: nokia rm 645 flash file
is the most common tool for this model. Best versions are 2011 or 2012. Firmware (Flash File): Search for "Nokia C3-00 RM-645 Flash File MCU PPM CNT."