Sp Flash Tool Error Status Ext — Ram Exception Patched

When you connect a powered-off MTK device to SP Flash Tool, the CPU wakes up in Boot ROM (Preloader) mode. The Preloader’s first job is to initialize the phone’s External RAM (DRAM) — the chip that holds temporary data.

The error STATUS_EXT_RAM_EXCEPTION means: The Preloader sent a command to configure the RAM, but the RAM returned an invalid response or crashed.

The "Patched" context: The tool is telling you that it detected the exception and applied a software workaround (a patch) to try to bypass the RAM check. The fact that you see this error means the patch failed. The RAM is still unresponsive.

Summary

Common causes

Diagnostic steps (ordered)

Fixes and workarounds

Risk & precautions

Example troubleshooting log template (for support or forum posts)

Conclusion STATUS_EXT_RAM_EXCEPTION_PATCHED indicates a DRAM initialization/access exception during flashing—most commonly caused by mismatched firmware/DA (including wrong preloader with incorrect DRAM params) or, less commonly, hardware RAM failure. Resolve by using correct vendor firmware/DA, verifying files, trying alternate tool versions, or repairing hardware if needed. sp flash tool error status ext ram exception patched

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Error: STATUS_EXT_RAM_EXCEPTION patched
Cause: Used standard DA instead of SLA-bypass DA.
Fix: Downloaded DA_MT6765_SLA_patched.bin from GSM-Forum. Renamed to MTK_AllInOne_DA.bin. Flashed successfully on first try.

You might see a green checkmark "100%" but still get this error. That is the "patched" part—SP Flash Tool tricks the CPU into skipping the RAM check long enough to write the Preloader, but fails when trying to write system or vendor. When you connect a powered-off MTK device to

Important: If you see this error after the red bar completes but before the purple (DAA) bar, your Preloader is locked. You need an MTK Bypass Utility (e.g., MCT, UnlockTool) to disable SLA/DAA authentication.