If SP Flash Tool persistently gives STATUS_EXT_RAM_EXCEPTION , try these alternatives:
: Newer MediaTek (MTK) devices require an "Auth" file or a bypass tool to allow memory access. Driver Failure sp flash tool error status ext ram exception
A corrupted preloader is a prime suspect. Troubleshooting SP Flash Tool: How to Fix "Status
Run flash_tool.exe as an and consider setting its compatibility mode to Windows 7 or XP SP3. 5. Use Auth Bypass Tools sp flash tool error status ext ram exception