'non-upgradability' originates from English, specifically composed of the prefix 'non-' + 'upgradability', where 'non-' meant 'not', 'upgrade' meant 'to raise to a higher version or improve', and the suffix '-ability' denoted 'capability or suitability'.

'non-upgradability' formed by adding the negative prefix 'non-' to 'upgradability'. 'Upgradability' itself formed from 'upgrade' (a verb/compound of 'up-' + 'grade') plus the nominalizing suffix '-ability'. 'Upgrade' developed in modern English from the combination of 'up-' (Old English/Proto-Germanic element meaning 'up, higher') and 'grade' (from Old French/Latin roots related to 'step' or 'degree').

Initially, the root 'upgradability' meant 'the ability to be upgraded'; with the addition of 'non-' it evolved to mean 'the inability or absence of ability to be upgraded'.