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## chantools fixoldbackup
Fixes an old channel.backup file that is affected by the lnd issue #3881 (unable to derive shachain root key)
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### Synopsis
Fixes an old channel.backup file that is affected by the
lnd issue [#3881 ](https://github.com/lightningnetwork/lnd/issues/3881 )
(< code > [lncli] unable to restore chan backups: rpc error: code = Unknown desc =
unable to unpack chan backup: unable to derive shachain root key: unable to
derive private key< / code > ).
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```
chantools fixoldbackup [flags]
```
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### Examples
```
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chantools fixoldbackup \
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--multi_file ~/.lnd/data/chain/bitcoin/mainnet/channel.backup
```
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### Options
```
--bip39 read a classic BIP39 seed and passphrase from the terminal instead of asking for lnd seed format or providing the --rootkey flag
-h, --help help for fixoldbackup
--multi_file string lnd channel.backup file to fix
--rootkey string BIP32 HD root key of the wallet to use for decrypting the backup; leave empty to prompt for lnd 24 word aezeed
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--walletdb string read the seed/master root key to use fro decrypting the backup from an lnd wallet.db file instead of asking for a seed or providing the --rootkey flag
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```
### Options inherited from parent commands
```
-r, --regtest Indicates if regtest parameters should be used
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-s, --signet Indicates if the public signet parameters should be used
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-t, --testnet Indicates if testnet parameters should be used
```
### SEE ALSO
* [chantools ](chantools.md ) - Chantools helps recover funds from lightning channels
