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J99

As the ECM is in seed status (Insite message), trying to transfer the first calibration via Insite looked the only way from what I read, and it made some progress. But just after the start of the Calibration Transfer, into the "Preparing ECM to receive calibration", it stops at 70% with Calibration Download failed message, and no more details. I tried with several different .ENI files for this engine downloaded from insite, same result.
I have a Nexiq 3 clone which so far worked well (able to use most of Insite features and upload/download calibration with Calterm), so I am wondering if it may be it impacting the transfer (checked latest drivers and tested connexion all OK, removed all auto detect features too...not better).
Any ideas welcome. Thanks