Browser keyboard refresh shortcut for Android 2.3.7?
There are several interesting browser shortcuts available:

Menu + J: Back
Menu + K: Forward
Menu + R: Refresh active page
Menu + F: Find
Menu + B: Open bookmarks
Menu + H: Browsing history
Menu + S: Open browser settings
Menu + I: Zoom in
Menu + O: Zoom out


(Source: Android Browser keyboard shortcuts)