If you use recovery mode does it erase all your photos
If you use recovery mode to restore your iPhone will it delete your photos?
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Yes. Recovery mode deletes everything from the device.
However, if you are at a point where you need to use recovery mode, then consider all your data already gone. If you need to use recovery mode for any reason, because you cannot access the iPhone any more, then there's no way to get to the data at that point anyway.
Hopefully you have backed up the iPhone regularly to iTunes or even iCloud (this one can be set to do so automatically), so you should not lose any data or photos.