Follow these simple steps if you are looking to update your favicon:
Step 1: On EcomSolid's Dashboard, click on "Theme Settings" on your left sidebar.
Step 2: You will have the option right on top of the page to upload a new favicon. Choose the file you need, make sure it is 32x32 pixels & in the right format and you're good to go!
Step 3: After you successfully uploaded your new favicon, make sure to scroll down the bottom of the page to apply and save your changes!