When changing the processor board, the software on the board is stored on the SD card in the card slot. There are different versions of software. Some versions (for instance from version WUMTGUI/2.x.xxx to WUMTGUIA/3.x.xxx) require some wiring changes on the controller. Take the SD card from the existing processor and insert it in the card slot of the new processor card to ensure compatibility with the existing machine. Be wary on thinking that the new SD card in the new processor will serve to upgrade the software on the existing machine.

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