I have a problem with disabling the Substrate Materials

UE 5.4, enabled Substrate → saved ~2k materials.
Need to ship on DX11 / decals / water.
If I disable Substrate, materials go black.
Any tool/email script to batch-revert to legacy or selective toggle?

Disabling Substrate Materials requires following the correct procedure for deactivating or altering their settings in the system. For troubleshooting steps, consult the software’s documentation or seek technical support.