To change the favicon.ico in Magento 22.214.171.124 with JM-Purity template:
if you view the homepage source you will notice that the type of the favicon.ico is image/x-icon a new higher res ico format.
So I created my favicon.ico using http://www.xiconeditor.com/ saved it as 16x16 as that is the same size as Magento\\\\\\\’s standard favicon.ico
Downloaded the new x-type formatted favicon.ico and copied it into:
which is where the favicon is picked up from.
You will notice in Windows Explorer that the favicon image is now visible as before it was just blank.
Ctrl F5 in your browser and bingo, your favicon appears in iExplorer.
Interestingly Chrome and Firefox will accept the old format.