Yes, it was! It went from 5.2.0 to 'bricked' to 5.2.5 - did the enhanced mtd hack (changed in MTD1 the values from 1 to 2 and modified in MTD6 the language from 2 to 1 and updated the checksum) - and updated to 5.4.5!
My other cam was on 5.1.0, updated it to 5.2.5 - did the enhanced mtd hack...