If a custom ROM flash or EFS clear wipes your IMEI to "null" or "0," you can restore from a previously saved QCN backup using the NV Reader Writer Tool. This is 100% legal because you are restoring your own original IMEI.
On some older Qualcomm devices, the SIM lock is controlled by NV item 44103 or 4477. By writing the factory "unlocked" value (often 00 or 01 ), you can permanently carrier-unlock a device without a code. Note: Modern devices use network-based authentication, making this rare.
Depending on the device chipset, different tools are used to access NV items: Reader Writer Tool: Nv Items nv items reader writer tool
The tool consists of three layers:
: A professional tool used by technicians for advanced radio and network management. Use Cases and Warnings If a custom ROM flash or EFS clear
Using an NV Items Reader Writer Tool carries significant risks. or render it unable to connect to networks.
Select or enter the specific identified in the Device Manager. Click Connect or Read to initialize communication. By writing the factory "unlocked" value (often 00
If he changed the value of the 5602 header from 0x01 to 0x00 , the kill switch would be rendered inert, a digital lobotomy that would protect millions from a flip of a switch they didn't know existed.
Download QPST, connect your old test phone, and practice reading NV 550 (IMEI) without writing anything. Master the art of backup, and the power of the NV tool will follow.
In the or USB Settings menu, select Qualcomm USB Settings .