CM554 QSC 8.3 ECM Reflash issue

[J99]

Hi all,

On a QSC 8.3 CAPS CM554 from 2003, I purchased a new ECM without Calibration, planning to do the calibration myself (as I was able to with Calterm 3.17 on the original one).

When trying to download the original cummins calibration, it throws an error "DCLDevice Write Failed. DCL Status = 27. The remote node could not validate the restricted access node."

When going into the Calterm 3 Unlock Menu, I can see that the ECM came in with Calibration Security "Secured" unlike the original one (and in RomBoot, normal, Module Status 5EED). Using the button "Switch" next to the Calibration Security, it is not doing anything.

Trying with Calterm 5.16 on another PC, when trying to reflash it tells me "Module is secure. Download to secured modules is not supported by Calterm".

Do you have any advice how I can manage to unlock this ECM and get my Calibration in ?

Thanks for your help !