All SVA1015 FW versions expect a Product ID 11402.
If the upgrade fails, it might be because you changed the Product ID to a different number.
Note that the SVA1015 uses a different FW than the SVA1032 model. If you followed the hack, you probably entered a new Product ID matching the SVA1032 (Product ID 11403) instead of the SVA1015.
That might be the reason.
Regards,
Vitor