Running into an issue installing Big Sur on top of Catalina 10.15.7 on 2019 Mac Pro. Downloads the installer no problem, but after a bit running - runs into a very generic dialog with An error occured installing macOS. You can try again to complete the installation. From the console, I can see that it tries to go through some networking, and everything is successful up until bridgeOS update download. Relevant lines seem to be: default osinstallersetupd Extracted update bundle to /var/folders/6s/n75m9_253g796wk4ltf1cg580000gn/T/10A8B5DD-2807-4313-8A80-3638E66DF7BD-BOSConfigureRequestOperation-ExtractedComponent default osinstallersetupd Extracting brain bundle from package component: usr/standalone/firmware/bridgeOSBrain.bundle default osinstallersetupd Extracted brain bundle to /var/folders/6s/n75m9_253g796wk4ltf1cg580000gn/T/F66591EB-B8A8-417A-8AE0-D2842DE69358-BOSConfigureRequestOperation-ExtractedComponent default osinstallersetupd Using update bundle: BOSUpdateBundle </var/folders/6s/n75m9_253g796wk4ltf1cg580000gn/T/10A8B5DD-2807-4313-8A80-3638E66DF7BD-BOSConfigureRequestOperation-ExtractedComponent/usr/standalone/firmware/bridgeOSCustomer.bundle> (17P6610: com.apple.bridgeOSCustomer, <BOSBundleComponentVersion: 0x7fa806cb7690>) default osinstallersetupd Using brain bundle: BOSBrainBundle </var/folders/6s/n75m9_253g796wk4ltf1cg580000gn/T/F66591EB-B8A8-417A-8AE0-D2842DE69358-BOSConfigureRequestOperation-ExtractedComponent/usr/standalone/firmware/bridgeOSBrain.bundle> default osinstallersetupd Minimum bridgeOS version requirement set: 18.16.12561.0.0,0 error osinstallersetupd Update bundle package component's bridge version (17.16.16610.0.0,0) doesn't satisfy minimum requirement (18.16.12561.0.0,0): 1 default osinstallersetupd Removing extracted update bundle: /var/folders/6s/n75m9_253g796wk4ltf1cg580000gn/T/10A8B5DD-2807-4313-8A80-3638E66DF7BD-BOSConfigureRequestOperation-ExtractedComponent default osinstallersetupd Removing extracted brain bundle: /var/folders/6s/n75m9_253g796wk4ltf1cg580000gn/T/F66591EB-B8A8-417A-8AE0-D2842DE69358-BOSConfigureRequestOperation-ExtractedComponent error osinstallersetupd Operations failed with error: Error Domain=BOSErrorDomain Code=110 "The bridgeOS update doesn't satisfy the given minimum version requirement." UserInfo={bridgeVersion=17.16.16610.0.0,0, minimumVersion=18.16.12561.0.0,0, catalogURL=https://swscan.apple.com/content/catalogs/others/index-11-10.15-10.14-10.13-10.12-10.11-10.10-10.9-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog, NSLocalizedDescription=The bridgeOS update doesn't satisfy the given minimum version requirement.} (formatted for readability) A bit of google searching got me thinking that there seems to be something hay-wire with T2 firmware update, but before I go nuking it on my dev machine, I am curious whether anyone else ran into this, or what likely is the culprit, when should we expect the required components be fully upgraded so the installer can download them?