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The only way I found is to put you picture in an usb flash drive, plug it into the printer directly and set the printer to 5x7 paper size.

I just tried again, the driver now allows me to set custom size to 5x7.

I don't have any other problems with the printer.  You might not have set it up properly, and may want to remove it and re-set it up to get rid of the errors.

No one provided an answer on setting the paper size to 5x7 or 4x6 on a PC.

Thanks.  I figured out how to set the paper size for 5x7 and 4x6 on the printer.  Hence I can print them with a USB memory stick.  But, when I tried to print from the computer.  The driver does not let me to specify custom size.