Once the NVRAM is wiped, the phone falls back to a default (null) IMEI, usually 12345678912345 or blank.
(That’s star‑hash‑star‑hash 3646633 hash‑star‑hash‑star) mt6580 imei repair code
Load the specific "BPLGUInfoCustomAppSrcP..." database file from your device's original stock firmware package. Connect the turned-off phone to the PC via USB. Once the NVRAM is wiped, the phone falls
Installing a wrong Android ROM often wipes the NVRAM partition. Once the NVRAM is wiped
Using the "Format All + Download" option in SP Flash Tool is the most frequent cause of lost IMEIs.