[Android Q&A, Help & Troubleshooting] jazzespresso:
Instruction: How to flash official firmware step by step

First of all, you are doing it wrong. What you are doing above is not for flashing full firmware. Here's what you need to flash firmware to your device using your PC

you need to have these;

[*]PhoneFlashTool_4.3.0.0_external_win32.exe - Download it here: (PhoneFlashTool_4.3.0.0_external_win32.exe

[*]Lenovo_TAB_S850Driver_V1.0.1.msi - Download it here: Lenovo_TAB_S850Driver_V1.0.1.msi

[*]And official full firmware for your device (looks like you already have it).

Instructions:

(Please note that screenshots provide here below are for just samples, and provide you visual help)

1. Install/run Lenovo_TAB_S850Driver_V1.0.1.msi on your PC, so that your PC will recognize your tablet.

2. Install PhoneFlashTool_4.3.0.0_external_win32.exe on your PC. This is firmware flashing tool you will be using.

3. Download firmware for your tablet for PC-based installation (official firmware), and unzip the file to the drive of your PC - see screenshot

4. Once you unpacked, you should have, something similar to this screenshot

5. Now, run phone utility flasher (remember you installed on step 2)

6. The main window of the phone flasher utility is as look like this;

7. Go to Settings Utility: File-Options

8. Uncheck Force sparsing, and click OK and exit to the main window of the utility.

9. Turn off your tablet, and put your tablet in downloading mode, to do so;

At the same time, press Power + Volume Down. After the release of vibration power, and keep hold the volume button until you see download mode.

10. Now, using usb cable, connect the tablet to your PC, wait for driver installation. Go to the Device Manager and check that the driver is installed correctly (this is related step 1 above)

11. Once you confirm your tablet recognized by your PC (step 10), check Phone flasher utility, it should look like this (when your tablet in downloading mode)

12: Now select the file for the firmware. In the utility, select the item Browse and then go to the window that opens to a folder - where we unpacked the firmware file and select pft_flash_lte_normal.xml

13. The utility is ready for proshivke- button Start to flash became active in the Flash file window appeared we have chosen a file:

14. Click the button Start to flash and do not touch the device firmware planshet- started. This process is displayed both on the PC and on the tablet

15. Patiently wait here...do not disconnect any cables or PC or tablet!

16. The phone flasher utility will soon announce the end of the firmware and you will hear disconnected from the PC device.

17. But if you check on the tablet, the process of installation still going on, so Do not turn off the tablet nor disconnect from PC yet

18. After a successful firmware install on the tablet, tablet will reboot and run! Now, there are in the process of installing the tablet itself several times changes the modes and restarts. it is normal

19. After installing the firmware tablet itself will start the operating system.

20. Tablet finally should reboot and start...

Some people like to change tablet's region code- if so, check www.lenovo-forums.ru web site (use google translate to translate the pages)

Good luck!:good: