LG-H811 IMEI repair failure

The original IMEI was blacklisted. I input the correct IMEI, connected the phone via micro USB cable, Octoplus recognized the phone, I started the IMEI repair but it froze on EFS, QCN backup. I stopped the process, and started the process again without backing up QCN. The IMEI is now null, no service. I cannot write the QCN to the phone, because it fails. I cannot repair NVM, because it fails.

I reflashed the original stock software, and attempted to write the QCN backup (the one from the support section), and it fails. Repair NVM still fails.
Can someone lend me a hand?

I have the phone in hand, and octoplus activated, I can’t successfully repair the IMEI…