Access the (often by pressing F1 + 000 or F1 + 111 depending on your model) to enable the SDS protocol.

Supporting Software (Uniden) * Sentinel (Uniden software) * NOTE: Sentinel is the only software that will apply firmware fixes. Radio Reference Wiki Updating Uniden Firmware SDS200 - Bearcat Warehouse

Ensure you have the legitimate .rar archive. Be aware that these files are often password-protected; you may need to contact the original uploader (e.g., via their YouTube channel ) to receive the decryption key.

What is the of the satellite receiver you are trying to update? SDS100 and SDS200 FAQ Page 2 - The RadioReference Wiki

Plug the USB drive into your receiver's USB port while the device is powered on.

Format a USB flash drive to FAT32 to ensure compatibility with your satellite receiver. Software Installation & Update