As tylerr07 said you'll need to edit the master page, however you'll need to use the ~sitecollection token to get to the root site of the site collection. eg: NavigateUrl="~sitecollection"

&lt;SharePoint:SPLinkButton runat="server" NavigateUrl="~sitecollection" id="onetidProjectPropertyTitleGraphic"&gt;
    &lt;SharePoint:SiteLogoImage name="onetidHeadbnnr0" id="onetidHeadbnnr2" LogoImageUrl="/_layouts/images/siteIcon.png" runat="server"/&gt;
&lt;/SharePoint:SPLinkButton&gt;


Redirect a subsite home link to the root site collection home page
I have Android 4.4.3 on a Nexus 5.
I connected the phone to a laptop, and there I deleted most of the files in the Downloads directory of the phone.
Nevertheless, these files still show up on the phone when I open Downloads (of course, when I try to open them, I get an error).  

Is there a way to refresh the Downloads list?
