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What revision ATV66 firmware is the VW3A66331 PC software compatible with?

Version 3.0 or greater control basket.
This can be determined by checking the sticker on the EPROM located behind the 2 inch square cover on the control board. The revision is also noted on a sticker with barcode that is on the main control board near the communication port for the keypad.

CTA-ID : 2021692
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