Reinstalling Windows 8.1 on a laptop with built in uefi win 8.1 Installation

Okay, My friend got a laptop, nice and shiny asus lap with i5 4200u 4gigs of ram and blah blah, and it was working smooth. Suddenly it has requested him to restart it, and he actually did, and boom! the windows wont load. He received a prompt similar to whats below.

And the continue again restarts the pc and get the same prompt. So i went to troubleshoot.

did refresh did reset, nothing works. it takes ages and at the end.. it says its failed! -_-

So tried advanced.

Tried all.

• System Restore - take ages and failed.
• System Image - no system image :(
• Automatic Repair - could not repair, log file is at *somepath*
• Command prompt - will get to it later
• UEFI Firmwware - restarts and go to bios
• Startup Settings - changes some startup settings, still doesn't do a thing, restarts and same previous screen pops up.

So did tremendous tests and I will not explain in detail those, but will summarize what did not work.

• Booting straight from DVD - doesn't work it cant read GPT disk.( It requires disabling secure boot, then enable csm and pxe opRom to be enabled. Then hit esc countinousely and when prompted select the dvd drive to boot)

• when enable csm and pxe opRom, there will be additional entry at first screen where continue, troubleshoot and exit there, saying Boot from other media. That will list DVD drive and that also doesn't work.

Okay. what worked is-

1. disable secure boot(at security tab on bios) and enable csm and pxe opRom
2. get the normal boot error screen->troubleshoot->Advanced->command prompt
3. go to the cd drive, mine was drive f:, and manually executed setup.exe typing setup
4. went through installation process, and hola! you can install windows in to C: drive! last time couldn't, it says GPT style and blah blah.
5. Installed and restarted, but sad :( same previous screen appeared!
6. Went to bios, and boot i noticed it goes to Windows Boot Manager, not c: drive
7. went to add boot option 
8. add boot option->give a name(screen shot shows file system, not that)
9.  
10. go to path for boot option, jus press enter for default file system, choose microsoft, scroll down and choose bootmgr.efi
11. create
12. save bios
13. choose your entry at boot override and system will restart, hola! windows loads!
14. Finally, delete Microsoft bootmanager entry from bios and secure boot,csm,pxeRom to default state

No files were altered ni disk wide format, and system boots up well!

PS: i lost the original key :( system did not recognize the key in bios. may be key was for win 8 and i only installed 8.1 pro