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SM-A3000 Cert File 100% Tested Free OK
This file exist in Samsung database from day of product your phone.
For Qualcomm device you cannot READ CERT but can only WRITE CERT from who have one from his device and Share it, (obvius not in same country/operator itc..), or from any server that will seller these.
You not damage you device if CERT is good,
FIRST MUST NEED OF CANCEL ORIGINAL CERT, the only mode for do it is Wiping EFS and after WRITE new one.
For Exinos devices You can READ/WRITE CERT.
WARNING: FOR YOU SECURITY, NOT FORGOT OF TO DO “BKP QCN WITH NETWORK AND ALL” FIRST OF “WIPE/Repair Security/EFS”, IT’S VERY IMPORTANT if anythingh goes wrong, also TEST first if you QCN can be write back first of Erase ORIGINAL CERT, if you cannot STOP HERE, not WIPE/Repair EFS in devices.
FOR QUALCOMM, YOU CAN WRITE CERT FROM OTHER N900 to OTHER N900X IF THIS HAVE “CERT” WITH FULL UNLOCKED AND IMEI/NETWORK OK!!!