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Unfortunately, at this device the FOTA update file is stored in a nhidden partition, not in the cache.
You can try to update your phone with SP Flash Tool by flashing the system partition only. In that case your user data will stay untouched but you won't solve that issue, what makes your phone non-updatable now.
This one a major update, so even if it's not an obligation, a factory data reset is highly recommended.
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