Okay, let's tackle this new filename the user provided. It's another Samsung combination firmware, but this time there's a .zip extension added. I need to figure out why that is and explain it clearly.

First, I'll break down the filename components like before. The model number here is G781U1, which I recall is the unlocked U.S. variant of the Galaxy S20 FE 5G. The "SQU5AUH1" part probably includes the carrier code and firmware version. The CL and QB numbers are the Change List and Quality Build identifiers, similar to previous examples. The "REV00" and "noship" tags indicate it's a pre-release for internal use.

Now, the new element is the .tar.md5.zip extension. The user might be confused about why there's a .zip at the end. I should explain that this is likely due to someone compressing the original .tar.md5 file into a ZIP archive, maybe to reduce size or for easier uploading. They'll need to extract it first before flashing. I should mention using tools like 7-Zip or the unzip command, and stress the importance of verifying the checksum after extraction to ensure the file isn't corrupted.

Also, the filename has "(2.1G)" which probably denotes the file size. I should note that this is just a size indicator and not part of the actual filename. The user might have added that for context, but it's not part of the firmware's naming convention.

I need to caution them again about the risks of flashing combination firmware—bricking the device, FRP bypass legal issues, and the lack of user features. Emphasize that this is for advanced users and technicians, not regular users. Maybe also mention that since it's a ZIP, they shouldn't flash it directly but extract it first to get the .tar.md5 file for Odin.

Double-check that all the components are correctly identified. For example, G781U1 is indeed the unlocked model, and SQU5AUH1's breakdown makes sense. Make sure there's no confusion between U and U1 models. Also, clarify the purpose of combination firmware again, just in case the user is new to this and needs a reminder.

Finally, provide step-by-step instructions on how to handle the ZIP file, extract it, check the MD5, and use Odin. Keep the tone helpful but cautious, ensuring they understand the potential risks involved.