Boot the device into by holding Volume Up + Volume Down while connecting the USB cable.
The internal Android security policy (SELinux) and locked bootloaders prevent write access to modemst1 and modemst2 , even if you gain temporary root privileges.
Locate the three fundamental network storage blocks: , modemst2 , and fsg .
┌────────────────────────────────────────────────────────┐ │ QPST Software Download Utility │ ├────────────────────────────────────────────────────────┤ │ COM Port: [COM4 Qualcomm HS-USB Diagnostics] │ │ x Restore Tab │ │ File: C:\patched_repair.qcn │ │ │ │ [ Start Restore Button ] │ └────────────────────────────────────────────────────────┘
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Click the button in QFIL. Wait for the process to finish successfully and let the tablet boot completely into the old setup screen. Step 3: Enable USB Debugging and Force Diagnostic Mode
Modifying system firmware, unlocking bootloaders, and writing to the EFS/NV RAM partition carries a risk of permanently bricking your device. Proceed at your own risk. Why Standard IMEI Repair Methods Fail on Patched Firmware
Set the active target path to your fresh patched_repair.qcn payload.
To bypass this security restriction, you must temporarily downgrade the tablet's firmware to an older, vulnerable security patch, write the original IMEI numbers, and then restore the device. Important Legal and Technical Disclaimer Boot the device into by holding Volume Up
Open (Go to Start Menu > QPST > RF NV Item Manager).
You should only perform this procedure to restore the tablet's original, legal IMEI—which is printed on the device's original box, back cover, or under the battery slot—following a catastrophic software corruption. Understanding the Hardware and the "Patched" Status
Open the Windows . Under the "Ports (COM & LPT)" drop-down menu, ensure it recognizes the device as Qualcomm HS-USB QDLoader 9008 .
: This happens if the firehose programmer file does not match your specific firmware chip variant, or if the USB connection dropped. Try a different USB port (preferably USB 2.0) and use the exact firehose file extracted from the TB-8504X stock ROM. Can’t copy the link right now
Open Windows Device Manager. Look under "Ports (COM & LPT)" for . If it appears, your device is ready. Phase 2: Downgrading or Flashing the Unpatched Base
If the IMEI is null due to a software "dead issue," flashing the complete stock ROM can sometimes reset the partition tables and allow the modem to initialize correctly. LENOVO TAB V7 IMEI REPAIR BY UMT TOOL
: Restoring your tablet's original IMEI (printed on the retail box or original chassis) is completely legal in most jurisdictions if the numbers were corrupted during a bad firmware flash. Spoofing, altering, or replacing an IMEI with a number belonging to another device is illegal in many countries.
Before any "patched" repair, always backup your current security data. and select the active COM Port. Navigate to Tools > QCN Backup Restore Backup QCN