I forgot the password to my Asus t100 tablet

I'm cleaning out my apartment on a Friday night and find my old Asus T100 tablet from college. I wanted to use it but there's a catch... It's a windows 8 tablet set up with a Microsoft account. No such luxury as password hash on disk to re-write. It won't connect to wifi to authenticate with the current password on the account. I can't remember what password was set in 2014. I figured ok, I'll do the old bait and switch with utilman.exe and cmd.exe with a live boot windows USB. There is an error at the command prompt that I can't access the C: drive because it's encrypted d'oh! Microsoft did a good job with security here, normally binary executable can be abused to escalate privilege in an operating system. Because eveything is encrypted I cannot modify binary executables in an offline attack.
Luckily... I still have access to the old Microsoft account under the new password. I got the encryption key from Microsoft's website https://account.microsoft.com/devices/recoverykey

1) Go into the BIOS and disable secure boot. This will trip bitlocker to prompt for a recovery key.

2) Click "Skip this drive"

3) Troubleshoot -> Advanced Options -> Command Prompt

4) Before we can mount the drive it must be decrypted. The syntax is as follows:

manage-bde -unlock C: -RecoveryPassword YOUR-BITLOCKER-RECOVERY-KEY-HERE

5) Navigate to C:

C:

6) Go to system32

cd C:\Windows\System32

7) Now for the bait and switch!

copy utilman.exe utilman.exe.bak
copy cmd.exe utilman.exe

What this will do is over write the accessibility program at the login screen with a command prompt running as local admin.

8) Next click "utilman.exe" to launch a shell

9) Enter the following commands:

net user Dave lol /all
net localgroup administrators Dave /add

10) Next step reboot and the local account will be available!