I will try to translate the steps to help you to fix the phone, sorry for my bad english
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1º Download this file:
https://mega.nz/#!C9sFFQZI!BcbX7SddS3DAVslgoUcLDdj-NRp894FG3tpYi_TZHCI
2º Open the directory "SP-Flash-Tool-v5.1528.00" and execute "flash_tool.exe"
3º Click in "scatter-loading" button and look for "MT6752_Android_scatter.txt" in "firm" and select it
4º Where appear "Download only" select Firmware upgrade", click "Download" and conect your phone
Wait some minutes and when appear a green check you'll can unplug your phone and turn on.
Now you're in KK and your phone works.
Anybody has tried upgrade to Lollipop with this method, it may not be safe...
1º Download a LP official ROM and copy in "firm", and replace all files except the preloaders and scatter files.
2º Open the directory "SP-Flash-Tool-v5.1528.00" and execute "flash_tool.exe"
3º Click in "scatter-loading" button and look for "MT6752_Android_scatter.txt" in "firm" and select it
4º Where appear "Download only" select Firmware upgrade", click "Download" and conect your phone
How I say before, it may not be safe, and I am not responsible for what might happen.
Luck!
PD: Si alguien ve algún error en lo que he puesto que me corrija y advierta al compañero.
PD: If you try it, please, tell us about.