0g-chain/migrate/v0_16/rollback.md

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# Kava-9 Rollback Instructions
In the event that the Kava-9 relaunch is unsuccessful, we will restart the Kava-8 chain using the last known state.
In order to restore the previous chain, the following data must be recovered by validators:
- The database that contains the state of the previous chain (in ~/.kvd/data by default)
- The priv_validator_state.json file of the validator (in ~/.kvd/data by default)
If you don't have the database data, the Kava developer team or another validator will share a copy of the database via Amazon s3 or a similar service. You will be able to download a copy of the data and verify it before starting your node.
If you don't have the backup priv_validator_state.json file, you will not have double sign protection on the first block. If this is the case, it's best to consult in the validator discord before starting your node.
## Restoring state procedure
1. Stop your node
```sh
kava stop
```
2. Copy the contents of your backup data directory back to the $KVD_HOME/data directory. By default this is ~/.kvd/data.
```sh
# Assumes backup is stored in "backup" directory
rm -rf ~/.kvd/data
mv backup/.kvd/data ~/.kvd/data
```
3. Install the previous version of kava
```sh
# from kava directory
git checkout v0.15.2
make install
## verify version
kvd version --long
```
4. Start kvd process
```sh
### be sure to remove --halt-time flag if it is set
sudo systemctl daemon-reload
sudo systemctl start kvd
```