If your device has a removable battery, pull it out, wait 30 seconds, reinsert it, and try flashing. If it is non-removable, let the phone drain completely, then charge it to at least 50% before trying again.
The flashing mode dropdown in SP Flash Tool dictates how partitions are written. Selecting the wrong option can trigger MMC blocks.
Modern MediaTek chipsets utilize a Secure Boot mechanism that locks down eMMC access if it detects custom modifications. Download a trusted, open-source . Launch the bypass tool and click the Disable Auth button.
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Windows 10 and 11 block unsigned MediaTek drivers by default. Restart Windows into "Advanced Startup" mode and select option 7 ("Disable driver signature enforcement").