To answer this questions, here is some streamlined background information about how the phones work software-wise.
Every phone has a serial number (IMEI). This is a digital data that gets connected to the given phone during manufacturing and it also gets signed by the manufacturer (this is the so-called Certificate). This certificate includes, among others, a certain data of the IMEI and, in case of new models, an ID code of the given phone to prevent the re-use of the certificate in a different phone. Practically, this makes it impossible to clone an IMEI number. This certificate cannot be reproduced.
When the IMEI or the digital signature is damaged, the phone is not working and even Samsung service centers cannot repair the broken phone. Now in that case you cannot make any calls, and the phone’s status will be “not registered to network”.
Our solution - the Patch Certificate - generally provide solution for such a problem.
The service can be reached only if the phone is connected in ADB mode, but we have to note here, that the Patch Certificate cannot solve network issues by it is own. It is important to do an IMEI REPAIR or a WRITE CERT services before you start the patching.
So the correct way to do the method is the following one:
1. IMEI REPAIR / WRITE CERT
2. PATCH CERTIFICATE
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