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There is a difference in AR2 v 1.9 and 1.92. A 1.9 wont work on a v5 where a 1.92 will, I dont know much about PAL PS2's but i would think the boards are the same as a US, NTSC PS2 so if you have 3 screws visible in the expansion bay it would be a v5. 2 screws a v4.
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