Transferred out of ECC, failed to confirm, but the balance was deducted，

i dont know what you are trying to do. transferred out of where? can you give me more information than this?

How can I do some rescanning in Sapphire client? It shows wrong balance.

edit the eccoin.conf file for rescan=1 to do rescan, there is no way to do this from directly within the sapphire UI.

Unfortunately, it didn't help.

Is it possible to dump private key and import into a new wallet? I am sure it will do the trick.

you can do this via the console in lynx. use the help command to get a list of all valid commands

Lynx stopped working on my PC for some reason, only Sapphire works, and there is no console...