I'm going to go out on a limb and assume that you're redirecting them with mod_rewrite based on their user agent string.
If that's the case, then something like this, added to the condition list:
RewriteCond %{QUERY_STRING} !ver=full [NC]
But, keep in mind that they'd need to keep this parameter in every request they send, including all other links they follow (potentially, depending on your current configuration) requests for static content like images and CSS.. you might want to consider setting a cookie instead of using a URL parameter (or trigger based on either, and set the cookie when the parameter is seen). We can do the cookie through some far more complex mod_rewrite stuff, too - I can assist with that config if that's the direction you'd like to go.
Provide your current configuration and we can talk specifics.