This method requires that you flash NVRAM backup file on your Infinix Hot Note x551 using MTK Droid Tools. ![]() Once this file is missing or malformed the NVRAM partiton of your MTK android device is corrupted, and that makes your phone's IMEI and radio functionality to malfunction or cease to work.Ĭorrecting Unknown Baseband and Invalid IMEI of x551 When this happens, the control for the Baseband and radio that controls the network signals are located in the NVRAM folder which is located in data/nvram/md/NVRAM/NVD_IMEI Or, when you use the Format All option of SP Flash Tool to correct certain errors in any attempt to flash Stock ROM using SP Flash Tool. Other times, this issue may occur if you flash wrong stock ROM firmware using SP Flash Tool as well. In most cases, the issue of Unknown Baseband, Invalid IMEI, No Service or No SIM card detected usually occur when you flash a new custom ROM on the phone especially when it's an upgrade from android KitKat ROM to Lollipop. ![]() Why Would you Have Invalid IMEI or Unknown Baseband On Infinix x551?
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