If you have bricked your Blu Vivo iv, or installed a custom recovery therefore could not upate OTA to KitKat 4.4.2, look here!
So everyone who needs to flash the new KitKat firmware from Blu follow these instructions!
Download the following file: https://www.dropbox.com/s/qt0i6d2og8...T8493.zip?dl=0
(Supplied by the amazing 'taalibj01')
If you have not previously installed the MTK drivers (usually installs from the phone when you plug it into the computer) please download and install from here:
Also download/extract SP Flash tool from here (latest version): http://androidxda.com/smart-phone-flash-tool
Before you start, when you connect your 'powered off' phone via USB cable whilst holding the up button, your phone should be recognised in 'device manager' as 'MTK COM USB (COM4)' or something similar, under the 'Ports (COM & LPT)' section. If it is not, then you need to install the relevant drivers (above).
Now you are ready to get started.
Turn off your Vivo iv phone and disconnect it from USB.
Unzip the BLU_D970l_V11_GENERICK_T8493.zip file to any location.
Open SP Flash Tool, and click the 'scatter-loading' button.
Navigate to the unzipped BLU_D970l_V11_GENERICK_T8493 firmware folder.
Double click the MT6592_Android_scatter.txt file
SP Flash Tool will then list all of the files it has read form the scatter file and automatically 'tick/check' each of the 'preloader/MBR/EBR1/UBOOT/BOTIMG etc... files.
Most guides will tell you to press the select 'Download' from the drop down menu, but I kept getting an error message, but if you highlight 'Firmware Upgrade' from the drop down box, you should be fine.
Click the 'Download' green button.
Now plug your phone in whilst holding 'volume up' button.
SP Tools should recognise the phone, and the bar along the bottom should turn RED. The phone will disconnect, then recconnect again after a few seconds, and the bar will turn Yellow and it will say 'Formatting', then it will Flash the files to your phone which should take 30 seconds or so.
After it is done, a nice green circle saying DONE will pop up. You can now disconnect your phone, wait a few seconds, then power on using the power button.
All Done!!! KITKAT is now installed on your bricked phone!