How to resync Geth after the Ethereum Hard Fork

Updating Homebrew

1. Open a Terminal window

2. Type brew update

3. Type brew upgrade

Resync Geth

1. Open a Terminal window

2. Type geth removedb to remove your chaindata.

3. Type y to confirm removing your chaindata. This can take around 10 seconds.

4. Type geth --fast --cache=1024 to start synchronising the chain. This can take around 2 hours depending on your computer.