How do I fix "QFIL Error: "Download Fail: Sahara Fail: QSAHARASERVER Fail: Process fail"" on the Lenovo Tab 4 8 Plus?

Occurs when the tablet exits EDL mode before handshake completion or when the Firehose programmer file is mismatched. Re-enter EDL mode using Volume Up + Volume Down + USB insertion, verify Device Manager lists COM port 9008, and click Download immediately after connecting.

How do I fix "QFIL Error: "FH_MSG_COMMAND: Firehose fail / Read packet fail"" on the Lenovo Tab 4 8 Plus?

Usually indicates a weak USB cable connection or an incompatible USB 3.0/3.1 port controller. Connect the tablet directly to a native USB 2.0 port on the motherboard using a high-quality USB Type-C data cable and avoid external USB hubs.

How do I fix "Device Manager displays "QHSUSB_BULK" instead of "Qualcomm HS-USB QDLoader 9008"" on the Lenovo Tab 4 8 Plus?

Indicates that the Qualcomm QDLoader 9008 driver is missing on Windows. Download and install the 64-bit Qualcomm HS-USB driver package, reboot the PC, and reinsert the USB cable while holding Volume Up + Volume Down.

How do I fix "Fastboot Error: "FAILED (remote: 'partition table doesn't exist')"" on the Lenovo Tab 4 8 Plus?

Occurs when attempting to flash individual partition images via Fastboot onto corrupted storage. Fastboot cannot repartition raw eMMC structures on this device — use QFIL in EDL 9008 mode to write full partition tables using rawprogram0.xml.

How do I fix "Tablet boots to "Encryption Unsuccessful" or infinite Lenovo logo loop after QFIL flash" on the Lenovo Tab 4 8 Plus?

Caused by leftover user data encryption keys from a previous Android version. Power off, boot into Stock Recovery by holding Volume Up + Power, select "Wipe data / factory reset", confirm wipe, and reboot.

How do I determine whether my tablet is TB-8704F, TB-8704X, or TB-8704V?

Check Settings → About Tablet → Model Number, or inspect the small laser-engraved regulatory block on the bottom rear back cover. TB-8704F is Wi-Fi only without a SIM tray; TB-8704X is global LTE with a SIM/microSD tray; TB-8704V is the carrier variant for Verizon and US Cellular.

Do I need to unlock the bootloader before flashing QFIL stock firmware?

No. QFIL operates at the Qualcomm Snapdragon 625 Primary Bootloader (PBL) level via Emergency Download (EDL 9008) mode. This protocol communicates directly with raw eMMC storage partitions and bypasses Android bootloader lock enforcement.

What key combination forces the Lenovo Tab 4 8 Plus into EDL 9008 mode?

Power off the tablet completely. Press and hold Volume Up + Volume Down at the same time, then plug in the USB Type-C cable connected to your PC. The screen will stay completely black, and Windows Device Manager will register a new COM port named "Qualcomm HS-USB QDLoader 9008".

What happens if I flash LTE firmware (TB-8704X) on a Wi-Fi unit (TB-8704F)?

Flashing LTE firmware on a Wi-Fi-only hardware unit causes baseband crashes, missing MAC address parameters for Wi-Fi and Bluetooth, or persistent boot loops due to missing hardware cellular modems.

What is the difference between QFIL Flat Build and Service (SVC) packages?

Flat Build packages contain individual unencrypted partition images (boot, system, recovery, modem) alongside rawprogram0.xml for standard QFIL recovery. Service (SVC) packages contain factory production scripts and diagnostics tools designed for automated service center restoration.

Lenovo

Lenovo Tab 4 8 Plus

Complete firmware flashing guide for the Lenovo Tab 4 8 Plus using QFIL. Covers TB-8704F, TB-8704X, and TB-8704V variants, QFIL EDL 9008 procedures, and unbrick solutions.

⚙️ Snapdragon 625 🛠️ QFIL 📅 May 2017 📱 Android 7.1.1 Nougat (Upgradable to Android 8.1 Oreo) 🔄 Updated Aug 15, 2026

Go to QFIL Guide 30 min ⬇️ Get Lenovo USB Driver ⬇️ Download Lenovo Tab 4 8 Plus Firmware

Lenovo Tab 4 8 Plus May 2017

Models: TB-8704F, TB-8704X, TB-8704V
Chipset: Qualcomm Snapdragon 625 (MSM8953)
CPU: Octa-core 2.0 GHz Cortex-A53
GPU: Adreno 506
RAM: 3GB / 4GB
Storage: 16GB / 64GB, expandable via microSD up to 128GB
Display: 8.0" IPS LCD, 1200×1920 pixels
Battery: 4850mAh (non-removable)
OS: Android 7.1.1 Nougat (Upgradable to Android 8.1 Oreo)
Connectivity: Wi-Fi 802.11 a/b/g/n/ac, Bluetooth 4.2, USB Type-C 2.0, GPS, 4G LTE (TB-8704X/V)

Colors: Aurora Black Sparkling White

Before you flash: Flashing firmware will erase all data on your device. Back up contacts, photos, and apps before proceeding. FlashGuideHub is not responsible for any damage caused by following this guide.

About the Lenovo Tab 4 8 Plus

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