: Using an incorrect or poorly modified stock ROM.
Because modern Nokia devices feature locked bootloaders and secure boot architecture, you must bypass the device protection before flashing individual partitions. Follow these steps carefully.
The progress bar at the bottom of SP Flash Tool will turn red, then yellow, indicating that the NVRAM file is being written to the device.
The bypass tool will detect the device in BROM mode and output a success message showing that the connection protection is disabled. Keep the phone connected and do not touch the buttons. Step 3: Configure SP Flash Tool Launch as an Administrator.
In the world of mobile phone repair and maintenance, few errors strike as much fear into the heart of a technician as the dreaded "Invalid IMEI," "No Service," or "Wi-Fi MAC Address Error." If you own a (or any Nokia smartphone running on Unisoc/Spreadtrum chipsets), the root cause of these issues is almost certainly a corrupted or missing NVRAM file .
The phone shows "Invalid" or "0" when dialing *#06# .
When a technician backs up or downloads an NVRAM file (usually via tools like , CM2 (Infinity-Box) , or SP Flash Tool ), it is typically a binary dump or a structured archive. It usually contains:
Connect the phone to the PC via USB cable (or Volume Up, depending on your device state) to trigger the MediaTek VCOM driver.
Restoring the NVRAM partition is the definitive fix for a Nokia 2.4 experiencing baseband errors, Wi-Fi errors, or empty IMEI slots. Always ensure you match your firmware version accurately and avoid using the "Format All" option during regular software updates to protect your device's unique hardware signatures.
When looking for a fix, you will encounter two different types of files. It is crucial to know the difference:
When this partition is corrupted, the phone essentially "forgets" it is a phone. It may boot up, but it will show no signal, fail to register on a network, and display "Unknown" for the Baseband version in settings.
NVRAM damage is almost always caused by manual software modifications. The most common causes include:
NVRAM issues rarely happen during normal daily use. They are almost always the result of manual software alterations, such as: