Unable to change index.html page as start page

Hi
I tried changing start page from index.html to index1.html(Just replica of index.html) but unable to load.
Changes done were
inject.js

return gulp.src(path.join(conf.paths.src, **'/index1.html'**))
.pipe($.inject(injectStyles, injectOptions))
.pipe($.inject(injectScripts, injectOptions))
.pipe(wiredep(_.extend({}, conf.wiredep)))
.pipe(gulp.dest(path.join(conf.paths.tmp, '/serve')));