Having the Flash Tool is useless without the proper drivers. Here is the installation playbook for Windows 10/11 (which usually reject old MTK drivers).
Follow this exact process to get a clean version of the tool. Flash Tool V5.1420 Download -
To verify your tool works, turn off your Android phone, hold Volume Up, and plug in the USB. If you hear the "USB connect" sound and the tool says "Searching..." you have succeeded. Having the Flash Tool is useless without the proper drivers
Supports both automatic and manual formatting of flash memory partitions. Download and Compatibility turn off your Android phone
Should you even bother with this older version? Here is a direct comparison.