Geoblock exception based on user agent

You can do it with an iRule which checks the User-Agent Header to be the one you want to white-list and then unblocks that request using ASM::unblock

Here is a sample iRule (replace 'My Magic User Agent' with User-Agent you need):

when ASM_REQUEST_DONE {
  foreach {viol} [ASM::violation names] {
    if { $viol eq "VIOLATION_ILLEGAL_GEOLOCATION" } {
      if { [HTTP::header "USER-AGENT"] contains "My Magic User Agent" } {
         ASM::unblock
    }     
    }
  }

}

Hope this helps,

Sam

P.S. Remember to enable 'Trigger ASM iRule Events' in your policy properties!