Dear Santu,
Your warranty period has expired. You will need to purchase a support contract in the hope of getting support on that product, please get in touch with our sales representative in India about that.
To answer your question directly, we do not provide board schematics because they are not evaluation board, they are proprietary designs owned by 4DSP. Normally all the information required is available spread across hardware used guides, firmware documentation as well as software documentation.
Now if you have some specific questions we will be glad to answer these.
Thanks,
Arnaud