When a user installs a custom ROM, downgrades their firmware, or experiences a failed software flash, the EFS partition—where this data lives—can become corrupted. The result is a phone with "No Service," an "Unknown Baseband," or a null IMEI. Why the "128GB" and "Tested" Labels Matter
The subject line of an email landing in your inbox reads simply: .
Verify that your phone is listed under the "Ports" tab (usually labeled COMxx ). 4. Restore QCN File Open or Software Download (within QPST). Go to the "Restore" tab.
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Extract the POCO X4 Pro 5G 128GB QCN tested.7z file using 7-Zip to a dedicated folder on your computer. 2. Enter Diagnostic Mode