in general, I decided to make a detailed manual for the firmware through SP Flash Tool
1) swing the official website driver, firmware and flasher =>
link2) the first thing we put the driver, I have some not established, but as I understand the main thing - GN_MTK_USBDriver (Factory) _V1.1.0.rar and MTK USB Driver_v1.0948.0.rar, after installing all the drivers, it is desirable to restart the computer
3) and then unpack the firmware flasher and in any folder, in a way which does not have different characters or Russian letters (best in the root directory)
4) edit the file Checksum.ini, change the value CHECKSUM_SWITCH = 1 CHECKSUM_SWITCH = 0, otherwise it will write the firmware does not match
5) run a SP Flash Tool as an administrator
6) Click on the Scatter-loading, go to the folder and select the firmware file MT6582_Android_scatter
7) take out the battery, attach the phone to the computer, we press on the format, wait a few seconds and insert the battery in a couple of seconds to go the cleaning process, after the successful completion window will come out with a green circle and the words Download OK
8) Then We perform all the same to Download, disconnect the phone from the strap, take out the battery to be connected, click on Download and likewise inserted through a couple of seconds the battery and wait for the process to complete
9) and of the most recent - the installation firmware, do everything the same as an 8-point, just select the Firmware ->Upgrade, waiting for the window Download OK
everything is ready - turn on the machine and rejoice