Sung's bi-amping system

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Confused's way is correct. It also needs to be master and slave configuration. I'm biamping with 2 X 250 Pro with no problems.

Would you please let me know your configuration and cable connection?
Do you connect left woofer and tweeter to master and right(w and t) to slave?
Or left w and right w to master and left t and right t to slave?

Those are two quite different configurations.

Connecting left woofer/tweeter to the master and right to the slave is the so-called "dual-mono" configuration and is the way Devialet normally intend the master/slave combination to work.  For that set-up, you must select "mono" when configuring the speaker outputs for both the master and slave.

Connecting the L/R woofers to one amp and the L/R tweeters to the other is the bi-amping configuration.  Although I haven't used my 440 in that mode I expect you should configure the speakers in both amplifiers to stereo, and then use the filter settings to low-pass filter the speaker outputs on the master (driving both woofers) and high-pass filter the speaker outputs on the slave (driving the tweeters).