No, I reset the ledger as I thought it wasn't working properly or I had set it up wrong. It gave me a new 24 word seed. Then I obtained both the BTC & LTC addresses separately - both SegWit. When I check my accounts on the ledger I always select the SegWit options as these were the addresses I obtained. When I got the addresses I got them from the 'Receive' option, not the 'Sign message' option in settings-tools.
Do you think my ledger could be damaged?