bios upgrade with aptio2 information added

Author: Christian Uhl

Additional/BIOS/XPS_15_9560_1.3.3.exe

@@ -3,13 +3,17 @@ This contains my modified files to run OS X 10.12.3, based on Andy^^s collection
 
 You can follow my guide if you want to install Sierra on your own dell, but be aware, the tutorial is originally for the 9550.  
 Best way is to download the 9550 repository and then overwrite the files with the ones from this repository.  
+
 Link: [Dell 9550 Sierra Installation Guide][1].  
 
 Not working:
 * Wifi (will never work, replacement required - [my suggestion][2])
 * nVidia GPU (Intel IGF works well)
 * SD Card reader
 
+## Firmware Update
+These files are only suitable for Firmware Version 1.3.0 or below. If you run a newer firmware, you may have to delete CLOVER/drivers64EFI/OSXAptioDrv-64.efi and replace it with OSXAptioDrv2-64.efi and add a customized slide to the boot arguments (for example slide=168 or slide=170). [More information][3]  
+
 ## Step 1:
 Download the files from the repository for the XPS 9550:  
 `git clone https://github.com/wmchris/DellXPS15-9550-OSX`
@@ -31,3 +35,4 @@ https://github.com/wmchris/DellXPS15-9550-OSX/blob/master/Tutorial_10.12.md
 
 [1]:  https://github.com/wmchris/DellXPS15-9550-OSX/blob/master/Tutorial_10.12.md
 [2]:  https://wikidevi.com/wiki/Dell_Wireless_1830_(DW1830)
+[3]:  http://www.insanelymac.com/forum/topic/319764-guide-dell-xps-15-9550-sierra-10122-quick-installation/page-29#entry2422676