when I use my hardware wallet (ledger) to restore my monero account , I found that it requires wallet creation date or restore hight. but when I type into my wallet creation date, the new public address is different from the address of my old account ,only if I type into my restore height,the new public address is the same as the address of my old account . the question is: 1.Is “restore height” necessary when I use hardware wallet(ledger)to restore my account? 2.if I forget my restore height ,how I restore my monero account with my hardware wallet?

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