If the screen displays "Contact Service" after flashing, the phone has suffered PM (Permanent Memory) or security field corruption. You must perform an RPL repair or write a clean PM file using a hardware service box.
Safely disconnect the USB cable, pull out the battery, reinsert it, and turn the device on normally. Important Safety Tips and Troubleshooting nokia 2690 rm 635 flash file
A fully charged Nokia BL-4C battery (the flashing process drains power, and a phone dying mid-flash will brick it). If the screen displays "Contact Service" after flashing,
Phoenix Service Software is the official flashing tool used for legacy Nokia devices. Follow these steps carefully: Step 1: Prepare the Software Environment Important Safety Tips and Troubleshooting A fully charged
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Check the or Dead Phone USB Flashing option in your software interface. This allows the tool to interface with a powered-down or bricked device. Step 5: Execute the Flash Process