The file is totally corrupt. In my binary file browser, it looks like this, full of zeroes:

Another symptom is that it is only 800K, when JPEGs from these cameras are normally in the 7-10MB range.

Another way to check is to ZIP it. A normal JPEG is already compressed and you gain very little by putting it in a ZIP (size gains are a couple of percent at best). Here you go from 800K to 1061 bytes.

What this means is that the file you extracted is worthless, but maybe another extraction from the media(*) with another tool could yield better results (though you tried a few already).

• SD card? I don't put too much trust in brand SD cards, and the no-name ones are handled with care, while I carry them to the nearest trash can.

The file is totally corrupt. In my binary file browser, it looks like this, full of zeroes:

Another symptom is that it is only 800K, when JPEGs from these cameras are normally in the 7-10MB range.

Another way to check is to ZIP it. A normal JPEG is already compressed and you gain very little by putting it in a ZIP (size gains are a couple of percent at best). Here you go from 800K to 1061 bytes, so there is very little data in it.

What this means is that the file you extracted is worthless, but maybe another extraction from the media(*) with another tool could yield better results (though you tried a few already).

(*) SD card? I don't put too much trust in brand SD cards, and the no-name ones are handled with care, while I carry them to the nearest trash can.