This error is frequently caused by driver conflicts.

: Newer versions (v6.x) can be stricter with security. Versions v5.1924 or v5.2020 are often more compatible with older MediaTek chipsets.

Sometimes newer versions (v6.x) are too strict with security checks. Many users find success by downgrading to a "sweet spot" version like or v5.2020 . 5. Hardware & Connection Check

Sometimes the "latest" version is not the most compatible for your specific device.

If you want, tell me the exact device model, firmware package name, SP Flash Tool version, and the full error log snippet; I’ll suggest targeted next steps.

If you are using an Auth Bypass tool, the connection might be unstable in the default USB mode. Go to > Connection . Switch the connection from USB to UART .