Updated compatibility & upgrading section, updated FAQ

README.md

@@ -359,6 +359,8 @@ and is reported to work with most Android variants, including stock ROMs.
 
 **XPrivacy is incompatible with LBE Security Master** ([issue](https://github.com/M66B/XPrivacy/issues/1231))
 
+**XPrivacy is incompatible with the security center of MIUI ([issue](https://github.com/M66B/XPrivacy/issues/1940))
+
 You need to use the quirk "noresolve" when using [GoPro](https://play.google.com/store/apps/details?id=com.gopro.smarty)
 ([issue](https://github.com/M66B/XPrivacy/issues/1751)).
 
@@ -408,7 +410,7 @@ Upgrading
 
 * **Make a backup**
 * **Do not remove the previous version** (or else your settings will get lost)
-* Download the new version
+* Download the new version (with a [pro license](http://www.xprivacy.eu/) you can use the menu *Help ...* > *Check for updates*)
 * Install the new version over the previous version
 * Wait until the Xposed installer recognizes the update (else XPrivacy might not be enabled)
 * Start the new version once (else Android will not send the boot completed event)
@@ -1162,6 +1164,10 @@ From version 2.99.35 AOSP mode can be enabled from the main settings (which will
 
 There is no need to force AOSP mode if XPrivacy recognizes your ROM as a compatible ROM.
 
+If you force AOSP mode, privacy sensitive data may leak.
+XPrivacy has lots of internal checks, so if something is going wrong,
+you will probably sooner or later get a debug info popup.
+
 For the benefit of others, please report if XPrivacy 3 works for the ROM you are using
 (also post a screenshot of the *About* of XPrivacy so I can see how the ROM can be recognized).