Changing pixel density metadata in JPEG

Hello:
Does anybody know of a way/utility to batch mode change the pixel density metadata in JPEG files? I have this Phillips digital frame which won't display images properly when the JPEG DPI information is 72, regardless of the real pixel width and height of the images.
Editing it in Photoshop works, but it also rewrites the data of the image, recompressing the JPEG a second time, cumulating artifacts.
Thank you for your suggestions,
Yann

All other applications do what they're supposed to with Windows font settings, so I'm not going to set it to 100% and mess them up because Firefox is weird.

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