Alternate way to boot in Recovery Mode with Big Sur

Just to share my tryout after reading first post of David Anderson who helped me to find this.

The environment it's little different from VMW Fusion, actually it's this:
<br>Guest OS: Big Sur 11.6
<br>Host OS: Big Sur 11.6 on MBA 2020 (Intel)
<br>Hypervisor: Virtual Box 6.1.28

I've tried every way to boot in Recovery Mode, either using nvram, or through EFI Internal Shell, all with no success (within my environment). 
- `sudo nvram "recovery-boot-mode=unused"`  ==> With this old (Catalina) var, I even get “Error setting variable” in Big Sur.
- `sudo nvram internet-recovery-mode=RecoveryModeDisk` ==> when rebooting GuestOS, seems variable to be ignored as MBA don't actually boot in Recovery Mode.
- `dmpstore -l csr.bin` ==> returns “No matching variable found.”

And also booting in EFI Internal Shell and looking for CoreServices/boot.efi, I searched through all FS*N*: mapping table entries (all vols/partitions of local internal SSD of MBA), with no success. It seems System/Library/CoreServices is hidden or encrypted (SSV?)



Then, as suggested by t0rr3sp3dr0 [here in GitHub][1], tried to look for CoreServices boot.efi, this way and I did as follow:

 - In VirtualBox under VM Settings —> Storage, mount Big Sur Installation image. And check “Live CD/DVD” option.
- Start VM and press ESC key
- Choose Boot Manager —> EFI Internal Shell
- Look for Recovery Partition, in my environment under FS7, type:
<br>
`FS7:`
<br>
`vol`
<br>
to check for HFS+.
- Type:
<br>
`cd System/Library/CoreServices`
<br>
`boot.efi`
<br>
`ENTER`

[![enter image description here][2]][2]


Finally, my GuestOS (BigSur 11.6) boot in Recovery Mode!


  [1]: https://github.com/geerlingguy/macos-virtualbox-vm/issues/46
  [2]: https://i.sstatic.net/ZP5pw.png