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When you upscale images as advised above, Photoshop creates new pixels estimating their values based on neighbouring pixels. Adobe recommends upscaling by no more than 10%, otherwise you run the risk of losing clarity. To go A6 to A5 you'll be adding, I guess, around 40% of additional pixels. You can compensate by reducing the resolution from say, 300DPI to 240DPI, and then upscaling - which adds fewer pixels (but still quite a lot), but at the cost of print resolution. Maybe try it and print a sample and see how it looks.