Built from scratch OpenCore. 0.7.1 with the latest kexts. Created the flash drive with createinstallmedia. Catalina from appstore. Nvram reset. On startup it hangs after creating ram disks. PS. Big Sur boots and installs without any problems. Catalina don't (( My laptop: HP Probook 4740s CPU: i7-3632QM (Ivy) RAM: 16 Gb Graphics: Intel HD4000, 1600 x 900 Audio: IDT 92HD87B2/4 SDD: ADATA SU800 256 Gb Ext. monitor (HDMI): Philips 223V, 1920x1080 submitted by /u/adminstig [link] [comments] [► Source]