I was trying to flash the itel it1520 stock rom from your given link in sp flashtool v5 in firmware update mode but after connecting my device it got detected as mediatek usb port(com11) and it starts formating but after some time failed with error
ERROR: S_FT_ENABLE_DRAM_FAIL_(0XFC0)
check your load matches to your target which us to be downloaded.
And now device is bricked not charging no boot loop nothing only detects in sp flash tool after pressing vol down and connecting usb.. And gives me the same error..