The upgradewallet RPC upgrades to the latest version if no version number is specified. New keys may be generated and a new wallet backup will need to be made
upgradewallet ( version )
*bitcoin-cli help upgradewallet
upgradewallet ( version ) Upgrade the wallet. Upgrades to the latest version if no version number is specified. New keys may be generated and a new wallet backup will need to be made. Arguments: 1. version (numeric, optional, default=169900) The version number to upgrade to. Default is the latest wallet version. Result: { (json object) "wallet_name" : "str", (string) Name of wallet this operation was performed on "previous_version" : n, (numeric) Version of wallet before this operation "current_version" : n, (numeric) Version of wallet after this operation "result" : "str", (string, optional) Description of result, if no error "error" : "str" (string, optional) Error message (if there is one) } Examples: > bitcoin-cli upgradewallet 169900 > curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "upgradewallet", "params": [169900]}' -H 'content-type: text/plain;' http://127.0.0.1:8332/