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	Create rollback.md (#1133)
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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 | ||||
| ``` | ||||
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