We understand that you're having issues booting to the Intel® SSD DC S3520 Series using IDE mode.
Please keep in mind that these new drives make use of the much newer 3D Nand technology. Even though AHCI is usually backward-compatible to IDE, some older systems will not be able to handle this well.
Since this is more of a compatibility issue rather than an unexpected error, we can't guarantee it will be resolved by a future firmware update. We will engage our additional resources and let you know what we find out for you. Please continue monitoring this thread.
We spoke with one of the SATA experts on our engineering team, and inquired on the reason why the S3520 Series doesn't support the command stated by your board manufacturer.
Currently the reason is because IDE commands that are superceded by AHCI command operations moving the product towards enhanced or greater performance. It's often necessary to balance between backward compatiblity and introducing a new product with better benefits and features.
If IDE commands are a must, you may need to continue using legacy products.
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We would like to know if you have any other question or if you require further assistance.