No nvram variable found Open Core 0.6.4 Catalina Installer

Hi,
I'm trying to install macOs Catalina using open core bootloader on my build. I've followed each and every steps described in Dortania, besides I did research on this forum about macOs installation processes. Any way I got stuck at no nvram variable found in verbose mode. Also, there was a log created on my usb showing 05:452 00:048 AAPL: [EB|#LOG:EXITBS:START].

My system specifications:
HP 290 G1 MT, 8350

Intel (R) Core (TM) i5-7500 CPU @ 3.40GHz,
8 GB DDR4...

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Author: ktmsulaim