У вашего броузера проблема в совместимости с HTML5
How to flash Lenovo A399 with sp flash tool?
First download file
Link : http://miraclesoftsolution.com/lenovo-a399-mtk6582-100-tested-scatter-file/
Facebook: https://www.facebook.com/miraclemobilesoftware/
Then Install usb Drivers
Then open sp flash tool
Specify file in scatter loading
Now press download button and connect cable
if an error appears PMT change of rom
Then select download only to select firmware upgrade
Then press download button unplug battery unplug cable then plug battery and
press download button and plug cable
Flashing complete..
Thanks for watching video