If you lose NVRAM without a backup, obtain the database files from a clean stock ROM of your device. Never mix chipset generations. With the right database and proper IMEI, full network functionality can be restored. Need a specific NVRAM database for your MTK device? Extract it yourself from the stock firmware using MTK Extractor tools—do not trust pre-made packs from unknown sources.
Before any firmware flash, always make a full NVRAM backup using SP Flash Tool (readback of nvram region) or a custom recovery. A 2 MB backup today saves hours of database hunting tomorrow. all mtk imei repair nvram database files
Introduction For technicians and advanced users working with MediaTek (MTK) Android devices, few issues are as common—or as frustrating—as IMEI corruption. A corrupted IMEI (often showing as "Invalid IMEI," "Null IMEI," or "IMEI=0") renders a phone unable to register on a mobile network. The root cause frequently lies in the device’s NVRAM (Non-Volatile Random Access Memory) partition. If you lose NVRAM without a backup, obtain