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digtal lookback failed

Category: Software
Product Number: AD-FMCOMMS2-EBZ

hi, I started the digital lookback(tx to rx) function of the ad9361 by using the command "echo 1 > lookback".Before this, sending and receiving data was no problem, working in FDD mode, using rx2tx2 mode, but when I used lookback, I couldn't receive any signals, what went wrong?