Boot Windows 7 after Mac OS upgrade to Sierra

Question

Upgraded Mac OS from Lion to Sierra. After that can't boot to Windows 7, successfully mounted and readable under Mac however. Boot with Bootcamp or with newly installed rEFInd leads to this message:

No bootable device -- insert boot disk and press any key

What is correct way to fix boot:

• bootrec.exe /FixMbr, ...
• GPT fdisk
• some other?

How to do use it and under which OS? Thanks!

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P.S. 1st variant does not work - checked. However this fixed error (reported in comments here) discovered by Disk Utility in partition table. Now utility reports partition is ok.

Answer 1

Uh, fixed. Seems while installing Sierra it totally erased MBR partition

1. First created rescue CD with GParted Live CD or SystemRescueCd
2. Boot from this disk and run gdisk /dev/sda from terminal to create Hybryd partition - instructions under the link. In my case I converted 2nd Apple HFS+ and 4th Windows NTFS partitions to hybryd and set bootable flag to Windows's one.
3. Reboot
4. Boot from Windows 7 installation DVD, select language and run System Recovery - Repair your computer link, follow Windows instructions
5. Boot Windows as usual