Windows 10: Can't boot Windows 10 after messing reserved & installation partitions

I removed Windows 10 x64 (1809)'s 16MB reserved partition located just before the installation partition (which I then resized to be 84MB smaller, with the 84MB unallocated space at the beginning) and increased the SSD's EFI partition, which was located just before the reserved partition, by 100MB (by adding these 16MB+64MB).

I also kind of destroyed the EFI folder on the EFI partiton by accidentally replacing the entirety of its contents with other ones (I actually wanted to add the latter, not replace existing ones), so I no longer have the Windows bootloader.

I installed Ubuntu after all this happened and, sadly, not even GRUB sees my Windows installation..

I'd really appreciate some hints on how to regain access to my Windows installation.

Some things I tried so far (I ran them from a Windows 8.1 Installation DVD, since I didn't seem to have a working Windows 10 DVD):

The commands
bootrec /ScanOs
bootrec /RebuildBcd

Both detected 0 Windows installations.

The command bcdboot c:\Windows /l en-us /s x: /f ALL gave me the error 'Failure when attempting to copy boot files.'


NOTE: I also posted this same question on these websites, but so far have not received an answer other than reformatting my entire HDD, which is the last thing I want to try:

https://www.tenforums.com/general-s...rved-installation-partitions.html#post1552350

https://superuser.com/questions/1392501/fsck-says-a-partition-is-mounted-in-ubuntu-recovery-mode

:)

 

Windows 10 clean install mess up partitions?

If I do a clean install of Windows 10, will it mess up the partitions I have on my 2TB drive?

 

W10 System Reserved Partition Error

Hi,

Have you tried all the suggestions above? If not, we suggest the resolution provided above. We also suggest that you follow the steps on this link:

“We couldn’t update system reserved partition” error installing Windows 10.

Let us know how it goes.

 

Windows 10 clean install mess up partitions?

No. I have such setup since Windows XP and it works great. 50GB chuck of drive is reserved for system partition and data partition is the remaining disk size. When installing new OS, I just delete the first partition, recreate new one and install OS. System is installed clean each time and all the existing data remains where it was, on the secondary data partition. This way you can change systems in matter of hours without any fiddling with your stored data.