Upgrade v4.0.0

cd $HOME
rm -rf kiichain
git clone https://github.com/KiiChain/kiichain
cd $HOME/kiichain
git checkout v4.0.0
make install

sudo systemctl restart kiichain && sudo journalctl -u kiichain -f --no-hostname -o cat

Recovering Existing Wallets

kiichaind keys add <key_name> \
  --keyring-backend test \
  --recover \
  --coin-type 118 \
  --key-type secp256k1