Też miałem z tym problem i przypadkiem udało mi się w końcu zrobić. W poniższym poście opis:
https://forum.android.com.pl/topic/262416-a8-50l-root-na-android-51/
Tak naprawdę to robiłem wszystko wg translatora z Rosyjskiego. Natomiast jak już nie wychodziło to zrobiłem trochę inaczej niż pisali i zadziałało.
Podłączyłem kabel usb dopiero po tym jak wcisnąłem "Download" a jak to nie zadziała to wciśnij i trzymaj baaaardzo długo Power na tablecie (oczywiście na wyłączonym).
W tym linku masz póżniej: (użyj translatora Yandex)
Прошивка смартфона/Планшета на МТК новым прошивальщиком версии 5.х
czyli:
Download and install to your computerUSB Driver (Look in the thread about your smartphone - I usually put them in the FAQ section). In principle, the entire line of smartphonesLenovoa few exceptions the drivers are identical. Refers to a driver package for firmware for smartphone (special modes)/ driver Installation work does not negate the need for driver installation mode firmware.
Downloadthe firmware (official or custom FOR PC!)and unpack the archive to the root of the PC disk(any)in a folder with a Latin name. The folder name should NOT contain Russian letters or characters. Everything you need, including the utility of flasher in the zip file. present initially (I mean the OFFICIAL firmware). In the case of custom bikes - you have to download separately.
All versions of the utilities for the firmware of Lenovo smartphones - SP_Flash_TOOLS
Disable the device from USB computer.Turn off the smartphone. If the battery is removable, remove and insert the battery back! a MicroSD memory card or Sim card to remove no need!
Install mode driver firmware - for those who have installed - skip.on the PC (example for Windows 7) to open the device Manager. To do this, right mouse click on my computer on desktop-properties-device Manager
Decompress the driver of the regimes in any convenient place.Links:
Download the driver package for firmware for smartphone (special modes) lenovo-forums.ru
Connectturned offphone to a PC. 2 seconds in Manager appears an unknown device... Quickly, before it disappears - Tapao on it - in the resulting window, click UPDATE DRIVER, and specify the path where we've unzipped the driver. if you did everything right you got when connecting off smartphone for 2 seconds will receive the following:
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Dodano: 10 styczeń 2016 - 12:44]
A masz może Roota ? Jeśli tak to robiłeś z Kitkata czy Lollipopa ?