diff --git a/lib/ua/parse.js b/lib/ua/parse.js
index b13478e..86e3db3 100644
--- a/lib/ua/parse.js
+++ b/lib/ua/parse.js
@@ -213,14 +213,14 @@ const orPatch = (or) => {
 }
 
 const andPatchTo = (andTo, andFrom, noEliminate) => {
-  if (andFrom.hasOwnProperty('$bin')) {
-    if (!andFrom.$bin) {
-      andKill(andTo)
-      return
-    } else if (andFrom.$bin && !Object.keys(andTo).length) {
-      andTo.$bin = true
-      return
-    }
+  if (andTo.hasOwnProperty('$bin') && !andTo.$bin) {
+    return
+  } else if (andFrom.hasOwnProperty('$bin') && !andFrom.$bin) {
+    andKill(andTo)
+    return
+  } else if (andFrom.$bin && (andTo.$bin || !Object.keys(andTo).length)) {
+    andTo.$bin = true
+    return
   }
 
   if (andFrom.$or && andFrom.$or.length) {
@@ -549,42 +549,23 @@ const removeOrs = test => {
   delete test.$or
 }
 
-const filterUA = (ua, key, filter) => {
-  for (let operator in filter) {
-    let val = filter[operator]
-
-    if (operator === '$in') {
-      ua[key].in = val
-    } else if (operator === '$nin') {
-      ua[key].nin = val
-    } else if (operator === '<=' || operator === '<') {
-      if (ua[key].max > val) {
-        ua[key].max = val
-      }
-    } else if (operator === '>=' || operator === '>') {
-      if (ua[key].min < val) {
-        ua[key].min = val
-      }
-    }
-  }
-}
-
 const generateFakeUA = condition => {
   if (condition.hasOwnProperty('$bin')) {
     return condition.$bin
   }
 
-  const ua = {
-    browser: { in: [], nin: [], min: -Infinity, max: Infinity },
-    version: { in: [], nin: [], min: -Infinity, max: Infinity },
-    prefix: { in: [], nin: [], min: -Infinity, max: Infinity },
-    platform: { in: [], nin: [], min: -Infinity, max: Infinity },
-    device: { in: [], nin: [], min: -Infinity, max: Infinity },
-    webview: { in: [], nin: [], min: -Infinity, max: Infinity }
-  }
+  const ua = {}
+  const keys = ['webview', 'device', 'platform', 'prefix', 'version', 'browser']
+  let i = keys.length
 
-  for (var key in condition) {
-    filterUA(ua, key, condition[key])
+  while (i--) {
+    let source = condition[keys[i]] || {}
+    ua[keys[i]] = {
+      in: source.$in || [],
+      nin: source.$nin || [],
+      min: source['>'] || source['>='] || -Infinity,
+      max: source['<'] || source['<='] || Infinity
+    }
   }
 
   return ua