Hi Lucas,
Welcome to Microsoft Community.
I'm Hahn and I'm here to help you with your concern.
I'm sorry to hear that you're having trouble with your Surface Duo. If you're stuck in the bootloader and unable to boot your device, you may need to recover your Surface Duo.
To do this, you’ll need to download a recovery image on your PC, and then install it on your Surface Duo. However, before proceeding with any troubleshooting steps, I recommend that you back up your data to avoid losing any important files. Recover Surface Duo if it won't start - Microsoft Support
Regarding your question about downloading send edl firmware files and instructions for Surface Duo 1st, I'm afraid that Microsoft does not provide such files or instructions for end-users. The firmware and software updates for Surface Duo are released through the Windows Update service, and you can check for updates by going to Settings > System > System Update > Check for update. Update Surface Duo - Microsoft Support
Hopefully, this process will help you recover your Surface Duo. If you have any further questions or need additional assistance, feel free to ask!
Your Sincerely
Hahn - MSFT | Microsoft Community Support Specialist