You've likely re-formatted it for no good reason seeing it's still bootlooping. If a device is truly 'soft-bricked' it has no access to Mass Storage Mode. Did yours have MSM available without Cure firmware loaded, or only after it was loaded? If it had MSM access without Cure fw, the bootlooping likely is due to something else entirely other than a corrupt file onboard anyway (now removed regardless, due to formatting it).

It important to know the exact error message you received from Updater.exe also.

EDIT: Your edit appeared in previous post as i posted this.