XPS 15 9500 laptop, correct? Next step may be trying a BIOS Recovery.  I believe XPS 15 9500 should support BIOS Recovery 3.  Read/follow the instructions for BR3 carefully. The BIOS Recovery image .rcv file is linked on this page. You'll need an empty (non-bootable) USB stick, probably not larger than 8 GB, that's formatted FAT32. Download and save the recovery .rcv file on that USB. Don't change its file name. Plug the USB into the laptop with power fully off. Plug laptop into its power adapter and connect adapter to a working wall outlet. Power laptop on and immediately follow the instructions to launch the BIOS Recovery. Fingers x'd...
BIOS upgrade failed and now it is going to auto recovery and this also blocked due to unsupported downgraded. Anybody have any idea to stop auto recovery? Or I just throw it away this extraordinary laptop?   [IMAGE]        
XPS 9500, BIOS update failed, Auto recovery also failed