Have you tried to re-install the OS update firmware first before running enterprise enabler? The OS will be a zip file: T55N0JGMVAUEN17400.zip
You can try to perform FactoryReset (T55N0JXXVRFEN17400.zip) then retry again.
May i know what is your device Build number?
In addition, EnterpriseEnabler is only for GMS build. Though it is no harm to apply it on professional configuration (non-GMS build), EnterpriseEnabler will check the OS version that device is running in recovery mode and skip to do anything if the running OS is non-GMS version.
Hope this helps.