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26.2 build 25C5048a tutto ok su amd

Tahoe 26.2 Beta 3

Tahoe 26.2 Beta 3 (25C5048a) Full Installer https://swcdn.apple.com/content/downloads/56/46/089-47048-A_C8AE83Z2PU/we67cuq14ot4eb8xju7bkmmhd2zbkrhfvf/InstallAssistant.pkg

Risolto Grazie al grande maestro @Anto65 tutto funzionante al 100/% Grazie di cuore

I know i am asking so much 🙂 could you put Rx 6600 in first slot? are you sure you are trying from my latest EFI? it seems you loose hdmi connection or there is always a signal also with black screen?

is it watercooled or you can remove easily it? because it is weird if your RX is working well in other os can you connect only a monitor to RX 6600 and try to boot to your USB as i see in your video? then will think to full installer problem 🙂 I have a doubt if it is a problem with installed 4090

bios settings are well done for OSX? usually is possible to load default settings, disabling secure boot keys and fast boot, also to set CSM off and UEFI on, 4G on should be enough for many setups

then with my efi you should see a "dos" verbose scrolling lines Boot menu i see there is from gtx 4090? We should see it on RX 6600 usb pen seems to be formatted well

it could be normal if you use 4090 try to connect your monitor(s) to rx6600 you should also prvide a full installer and not a recovery installer because in tahoe your ethernet card could not work and a recovery installers needs a working one ethernet

Benvenuto. Ci sono post datati.....???? Si forse....ma ci sono anche molti freschi freschi di giornata.

Do you mean also no video input of your bios scanning? or do you see opencore bootloader? you must start from your USB pen or disk and you have to format it in a proper way for EFI

/Library/Developer/KDKs/ ... intendevo come ultimo il KDK non OCLP-MOD

This i have attached is an EFi for your system I don't know which OS you are trying to install and if you disable your on board wifi which is not compatible with OSX Other unknown part is where your 4090 is installed On OSX your motherboard needs a SSDT bridge if you use RX 6600 on you lower PCIE slot however if you are trying to boot Sequoia or Tahoe or lower you can try this: EFI.zip post a photo or a video where it hangs 🙂 By the way, in your latest EFI you missed to update AMD Kernel Patches to latest useful if you are trying Tahoe installer

macOS Sequoia 15.7.3 -24G416-👍

Not useful for AMD using OC simplify your EFI misses completely MMIO whitelist part i would suggest to use my initial EFI in this post (updating kext, amd kernel patches and opencore) and post again your result and EFI

Prova ad usare CleanNvram.efi.zip mettilo nella cartella Tool e va dichiarato nel plist , al boot riavvia ancora una volta dopo averci cliccato

macOS Sequoia 15.7.3 (24G416)

Non hai imparato ancora il Cinese ? 😅 Devi essere collegato con la lan " Errore: mancata corrispondenza MD5 KDK: verifica del toolkit di debug del kernel non riuscita. Riprova. Se il problema persiste, assicurati di scaricare tramite una connessione di rete stabile (ad esempio, Ethernet). OK. Controllo della validità del checksum in corso... " Hai l ultimo KDK installato ? KdkSupportPkg in caso rimuovi quello precedente