Telit Firmware update failure

Has anyone had issues applying the firmware update on the Telit modules, I have several of them(LE910C1-EU) and some failed to update, I can’t find anything on rolling back/factory reset etc so I can try again, have tried several times on different base hats and its definitely the Telit module that is the problem. I need the update as it fixes the really slow TTFF.

Thanks