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I forgot to update my iPhone 5 to 10.3.3 if I asked my uncle to update it instead of restoring it will my data still be on there, is the update still available
Upgrading your iOS shouldn’t loose your data. In any case you should always backup your phone or any computer! Just in case your phone sprout legs and runs off ;-} How about just backing it up to the iCloud? You have 5 GB free! More than enough to save your phones contents. That way you’re sure not to loose anything.
You can’t restore your iPhone 5 to iOs 8 since that iOs version is not signed by Apple anymore. You’ll have to settle for iOs 10.