Error (18948): Error message received from device: Bitstream error. (Subcode 0x0001, Info 0x00000003

The SDM (Secure Device Manager) is not for user assignable logic. It is used for configuring the FPGA. This Stratix 10 device is a Smart VID device, which gets voltage supply from a PMBUS complaint power regulator.

It interacts with the regulator after power up and before configuration. For this operation to happen correctly, you need to assign the pins correctly. Please refer below link:

https://www.intel.com/content/www/us/en/docs/programmable/683418/21-1/specifying-parameters-and-options.html

Regards