My iOS remains the same as whats inside my iPhone I bought it 18months ago, which is version 4.2.1, I am told by an Apple shop that its too old to do a proper update, unless all my data will have to be erased !! is this true ?  if so, how to get round it

my iOS remains the same as whats inside my iPhone I bought it 18months ago, which is version 4.2.1, I am told by an Apple shop that its too old to do a proper update, unless all my data will have to be erased !! is this true ?  if so, how to get round it ?    Chuck

Be sure to do a backup before updating as protection. Photos should
be synced with your computer, music should be in iTunes, documents
should be backed up on your computer as should contacts in whatever
program you use on your computer. You should already have backups
of your important information to prevent loss in case of theft, crash,
physical damage. The question is not if your hard drive will crash but
when, and you iPhone is not a backup device nor fit for the only
source of any document, picture, music, movie, contact or otherwise
irreplaceable information.

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