MP 1,1-5,1 mac pro 2008 with flashed ati radeon hd 5770

[Wanano_]

I have old 2008 mac pro with flash ati radeon hd 5770. And I wanted to upgrade it, but I had no money so i tried to flash it. The flash seemed to be succesful, but I think it isn't properly flashed. It still works, and I can get into macOS recovery settings. But, I still can't get into startup manager. Do you guys know why this happens and how to fix?

 

[Macschrauber]

the most common mistake is not having the proper keyboard / keyboard connection.

USB 1 Keyboard connected directly on the stock USB Ports. No USB3 card, no hub, no extension cables.

Best choice is an apple keyboard from the days the Mac Pro was made.

 

[Wanano_]

the most common mistake is not having the proper keyboard / keyboard connection.

USB 1 Keyboard connected directly on the stock USB Ports. No USB3 card, no hub, no extension cables.

Best choice is an apple keyboard from the days the Mac Pro was made.

The keyboard works fine, but I get black screen instead, just like before.
Edir: also, I am using apple keyboard, but a little outdated I think.

 

[Macschrauber]

to get preboot commands to the efi firmware it needs a rather old keyboard.

you can check if it works for preboot keys with the nvram clearing keys (cmd-alt-p-r) that works without efi bootscreen gpu.

 

[Wanano_]

to get preboot commands to the efi firmware it needs a rather old keyboard.

you can check if it works for preboot keys with the nvram clearing keys (cmd-alt-p-r) that works without efi bootscreen gpu.

The keyboard works, just it isn't keyboard problems.