Technical Support iMac Retina 5K 2019 820-01236-A

[user48165]

Hi ! I have iMac Retina 5K 2019 820-01236-A . I program bios with this bin file from your website . Now work only with mojave os and is so slow on startup 3-5min. i tray to put catalina os go to error compjuter need to restart . Can you help please? This is my bios file bin.