Downloaded the latest version and synced for quite some time. Entering in console myriadcoin-cli importprivkey "myprivkey" lead to error: Method not found (code -32601)
If you're using the debug console window within Myriadcoin-core you do not need to add "myriadcoin-cli", you would use only "importprivkey myprivkey". If you're using a terminal like bash, you would need to use "myriadcoin-cli importprivkey myprivkey". Are you certain you've typed in the correct command? (This looks like a typo error message.)