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You can check if your eject line is soldered correctly. Try stealth mode, if it goes to stealth mode, then it's correctly soldered, if not than something is wrong.
For me stealth mode worked with the reset button instead of the eject button and I had exactly the same problems. It was also installed by professionals.
DMS3 V2 fw 1.8 in console V5.
my v9 dms3 will play backups useing both gs2 2.0 and 1.9 also ar max but all mine are copys i got the origianls put away due to they stop working very ez and there hard to backup