Stop the service and reset the data
sudo systemctl stop elysd
cp $HOME/.elysd/data/priv_validator_state.json $HOME/.elysd/priv_validator_state.json.backup
rm -rf $HOME/.elysd/data
curl -L http://snapshots.liveraven.net/snapshots/elys-network/elystestnet-1_latest.tar.lz4 | tar -Ilz4 -xf - -C $HOME/.elysd
mv $HOME/.elysd/priv_validator_state.json.backup $HOME/.elysd/data/priv_validator_state.json
Restart the service and check the log
sudo systemctl start elysd && sudo journalctl -u elysd -fn 100 -o cat