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Windows Partition Booting Issue After Updating System?

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Hello. I have lost access to my Windows 8.1 Partition. I cannot mount, access, boot, or safeboot.
Previously I would boot via Windows Boot Manager to either 8.1 or Mavericks.
The HDD is setup like so; 1TB with 2 Partitions. 500GB Mavericks + 500GB Windows 8.1


Heres a timeline of what has happened:
-I installed a Nvidia Geforce GT 740 4GB DDR5 (works now, will report more after this is clear)
-Finished troubleshooting Shutdown and Sleep issues
-Windows 8.1 partition was working at this very point
-Updated mobo bios from F8 to F9
-Updated 10.9.2 to 10.9.5

3 days worth of trial and errors and I am still stuck.
Maybe the values below can shine some light on the issue:

diskutil list

/dev/disk0
#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *80.0 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_HFS Backup OSX 20.0 GB disk0s2
3: Apple_HFS Gotham City 59.5 GB disk0s3
/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_HFS Maverick 499.6 GB disk1s2
3: Apple_Boot Recovery HD 650.0 MB disk1s3
4: Microsoft Basic Data 499.8 GB disk1s4
sudo fdisk /dev/rdisk1
Disk: /dev/rdisk1 geometry: 121601/255/63 [1953525168 sectors]
Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>
2: AF 1023 254 63 - 1023 254 63 [ 409640 - 975751352] HFS+
3: AB 1023 254 63 - 1023 254 63 [ 976160992 - 1269536] Darwin Boot
4: 0C 1023 254 63 - 1023 254 63 [ 977430528 - 976093184] Win95 FAT32L
Disk Utility Screenshot and a Stock Internet picture of WBM so that this post makes sense.
Disk Utility Screenshot.png
Stock Image of Windows Boot Manager.jpg

My ultimate goal is to get to the Chimera screen which will allow Mavericks or Win8 to boot... without having to lose ALL of the data and settings on the Win8 partition. (My Mac partition is backed up, however). I don't mind replacing Windows Boot Manager with Chimera.

Do I need to boot via Linux and use the methods prescribed for GPT Sync issues?
I appreciate any feedback. Thank you in advance.

Setup:

Gigabyte GA-Z77-DS3H Motherboard
Intel Core i3-3225 Processor @ 3.3GHz
Corsair XMS3 1600MHz DDR3 4GB Kit (1x4GB)
Corsair Builder Series 430W Power Supply
1TB Seagate Barracuda 7200RPM
 

Going Bald

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The problem here is that when Win8/8.1 is installed it puts the boot manager in the BIOS. This sucks, because a BIOS update then makes Win8 unbootable due to no boot manager. Only way to fix is use the install media to repair it.
 
Joined
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Messages
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Motherboard
GA-Z77-DS3H
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i3-3225
Graphics
GT 740
Classic Mac
  1. Power Mac
Mobile Phone
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I read a lot of your guides GB, thanks for chiming in!

My recommendation to anyone with this same issue will be to update your BIOS and then follow one of the guides to get a fresh setup. It wasn't worth the time and effort to go any other way imo. I was better off recreating my Win8 system (which is now backed up like my Mavericks drive in case something in the future happens)

I followed the guide in link below with good results:
http://www.tonymacx86.com/multi-booting/96000-guide-dual-booting-mountain-lion-windows-8-a.html
 

Going Bald

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I read a lot of your guides GB, thanks for chiming in!

My recommendation to anyone with this same issue will be to update your BIOS and then follow one of the guides to get a fresh setup. It wasn't worth the time and effort to go any other way imo. I was better off recreating my Win8 system (which is now backed up like my Mavericks drive in case something in the future happens)

I followed the guide in link below with good results:
http://www.tonymacx86.com/multi-booting/96000-guide-dual-booting-mountain-lion-windows-8-a.html

You can avoid this problem if you use the Windows 8 version of BIOS updating provided by the OEM. If this app is run under Win8, Win8 then has the files updated automatically by the updater app without having to resort to the install media to recover the boot sector/BIOS files.
 
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