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k thx i'll try again when i can

I used OpenCore

you don't use opencore for efi?

'A required firmware update could not be installed'

would like to put Monterey on it , then Ventura

'A required firmware update could not be installed' how to go about attaching an efi? it does not let me select(and what format .dmg?)

I followed this guide for big sur the efi was from Github sniki for HP 6300-HP8300 Install Big Sur on the HP 8300 Elite - Part One & Two

I followed this guide for big sur the efi was from Github sniki for HP 6300-HP8300

I will as soon as I can

currently nVidia GT 740. I tried to install with a RX 560, and still got the same firmware error

I would like to install Monterey then Ventura

this is what I found 0n another site. Also another site said to just change the smbios to imac 16,2 I forgot how. been a while as I only am running Big Sur. I would like to get to Ventura if possible with an Ivy bridge cpu, until I can upgrade to 8th or 9th gen computer So, before allowing you...

I have an HP 8300 Elite Mt 3.4 GHz Quad-Core Intel Core i7 16 GB 1600 MHz DDR3 NVIDIA GeForce GT 740 4 GB Currently running Big Sur osx 11.7.9 I'd like to install Ventura but I cannot even install Monterey. I get the firmware update error I have an MSI Radeon 560 4GB card for ventura or...