Troubleshoot After patch system reserved drive got drive letter as C

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After patch system reserved drive got drive letter as C:\ and booting drive as D:\
Issue: C drive now D drive and not booting.

Troubleshoot:
1. Use the System File Checker tool to repair missing or corrupted system files -No luck.
2. Fix restart problems after you install update rollup 2919355 in Windows 8.1 or Windows Server           2012 R2          - I'm lazy so not tried.
3. Not tried below one:
         1. Keep tapping F8 during the early boot phase.
2. Select Repair from the menu.
3. Log on as Administrator if prompted.
4. Select Repair when prompted.
5. Select the Command Prompt from the menu.
6. Identify the correct drive letter for your Windows installation. It could be a drive other than C: but it won't be X:. You do it by typing the commands
    dir C:\Win*
    dir D:\Win*
    dir E:\Win*
    until you find the Windows folder.
    I will call that drive "Q:".
7. Type these commands:
    cd /d Q:\windows\System32\config
    xcopy *.* Q:\MyRegBack\
    cd  RegBack
    dir
8. Examine the dates of the Software, System and SAM files. Were the files created before or after your problem became apparent?
9. If they were made before the problem became apparent then you can type these commands:
    copy /y software  ..
    copy /y System  ..
    copy /y Sam ..
    (the two dots are part of each command)
10. Reboot normally. If things do not work out then you can backtrack by copying the original registry files from Q:\MyRegBack to Q:\Windows\System32\config.
Note that time is of the essence. Windows will automatically overwrite the registry backup copies after some days.

4. Now I got Error: INACCESSIBLE_BOOT_DEVICE AND Oxc000000f

 5. Tried below one work.

 Windows Recovery Media (flash drive and ISO disc)
repair
restore
system image
Install (custom & upgrade) 
Command Prompt
Bootrec /fixboot
Bootrec /fixmbr
Bootrec /scanos
Bootrec /RebuildBcd
bcdedit /set {default} recoveryenabled No

 6. Before that I tried below on, but not successful.

 Here we need to set drive C inactive at first, and then mark the system partition active. Detailed steps are as follows:
  • Type list disk and press on Enter.
  • Type select disk n (n is the number of the disk you will operate) and press on Enter.
  • Type list partition and press on Enter.
  • Type select partition n (now n is the number of drive C) and press on Enter.
  • Type inactive and press on Enter.
  • Type select partition n (n is the number of the correct system partition) and press on Enter.
  • Type active and press on Enter.
  • Type exit and press on Enter to safely quit from diskpart.



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