Cannot access my computer SOS

Hello! Today I was updating the Mac OS on my MacBook Pro (Lana Kulbashna Mac Book Pro 13)retina late 2013 and it ended up with an error thus I had to reinstall the os in a recovery mode. But I have the firmware password on my disk which I do not remember. So the only option I could use to somehow recover my computer was to erase it from the “Find my Mac”. So I did. And after erasing it asked to enter the 6 didgit pin lock code which was produced during the erasing process. I thought this one was for a one time usage only, as it was all the previous times before when I had to access to the Apple ID on different devices. But it turned out that this only code can actually launch my MacBook. And I did not write it down of course, it was not mentioned to save it anywhere. I tried to erase the computer from the iCloud hope it will help to skip the password but it also did not work. All the information I have is that activating code was generated on the 24th May 2019 08:52 PDT. Do you have it mentioned in your system? Thanks for considering my request