Hello! Last week I bought used Surface RT 64 Gb Model: 1516 with next problem:

Recovery  
Your PC needs to be repaired.  
A required device isn't connected or can't be accessed.  
Error code: 0xc000000f  
You'll need to use the recovery tools on your installation media. If you don't have any  
installation media (like a disc or USB device), contact your system administrator or PC manufacturer.  
If I try to press the Windows key to "try again", I get:    
Recovery  
Your PC needs to be repaired.  
Windows cannot verify the digital signature for this file.  
File: \WINDOWS\System32\winload.efi  
Error code: 0xc0000428  
You'll need to use the recovery tools on your installation media. If you don't have any  
installation media (like a disc or USB device), contact your system administrator or PC manufacturer.  
I've tried download the Recovery Image from Microsoft for my Surface RT (using serial number). Use official manual for creating Recovery USB (format flash in FAT32 and copy files from downloaded archive, Press Volume- & Power Release & Release Volume- after Surface logo shown). Trying to boot from USB - nothing happen, I got BSOD! Trying to enter UEFI/BIOS (Press Volume+ & Power Release & Release Volume+ after UEFI/BIOS shown) - nothing happen, I got BSOD! Everytime I got same errors: first 0xc000000f and 0xc0000428 after pressing Win Key.    
I use different Recovery Images for different regions with Win 8.0RT and Win 8.1RT, find & download ready custom images and trying to boot from... Use USB flash-drive 2.0 and 3.0 (different sizes 8 Gb, 32 Gb)    
The tablet does not respond to connected USB flash-drive (but USB port is Ok). I've tried to boot from MicroSD :/ And nothing again!    
I am tired please help me to solve this problem :(
				Windows: A family of Microsoft operating systems that run across personal computers, tablets, laptops, phones, internet of things devices, self-contained mixed reality headsets, large collaboration screens, and other devices.Hardware Performance: Delivering / providing hardware or hardware systems or adjusting / adapting hardware or hardware systems.