Plug it into the unit; it should automatically detect the update. If not, look for a "Local Update" option in the system settings. SP Flash Tool (Deep Flash/Unbricking) Install MediaTek VCOM drivers on your PC. Scatter file from your firmware folder into SP Flash Tool.
Never turn off the ignition or disconnect power during the update process, even if the screen stays black for a long time. mtk 8227l firmware link