T2 BridgeOS IPSW

[sznaps]

Does anyone know how I can obtain the bridgeOS IPSW for 17P50521d? Something happened to my macbook pro running catalina and now it's booting into DFU requiring a restore from a secondary mac using usb-c or thunderbolt. I've run into an issue where I can't update it because it appears configurator 2 cannot find a matching version, and can only obtain the currently released version. This has essentially bricked my macbook making it unable to boot at all. In fact, it doesn’t turn on at all. No key combo or period of holding down buttons works, only DFU.



Any guidance would be appreciated.

 

[tsialex]

Does anyone know how I can obtain the bridgeOS IPSW for 17P50521d? Something happened to my macbook pro running catalina and now it's booting into DFU requiring a restore from a secondary mac using usb-c or thunderbolt. I've run into an issue where I can't update it because it appears configurator 2 cannot find a matching version, and can only obtain the currently released version. This has essentially bricked my macbook making it unable to boot at all. In fact, it doesn’t turn on at all. No key combo or period of holding down buttons works, only DFU.



Any guidance would be appreciated.

It's the BridgeOSUpdateCustomer 041-94935 package, good luck!

 

[sznaps]

It's the BridgeOSUpdateCustomer 041-94935 package, good luck!

View attachment 853125

Okay good so it has been released but unfortunately I can't use that to restore the FW. I have to use the T2/iBridge in DFU, as it only boots to DFU. The only packages it accepts in DFU are IPSW and I can't seem to locate it anywhere.

 

[tsialex]

You only will download 041-94935, or the equivalent IPSW, if you have the Catalina Developer Profile installed, like iOS devices T2 don't accept downgrades and the official Mojave don't have this package yet. Try this:

• Install Catalina on the Mac that you gonna run Apple Configurator,
• install the Catalina Developer Profile (maybe the Public Beta will work too, if you don't have access to the ADC),
• reboot,
• open Apple Configurator and then try to do the restore.

P.S: you probably need to do this before DP6 is released.

 

[sznaps]

View attachment 853226 You only will download 041-94935, or the equivalent IPSW, if you have the Catalina Developer Profile installed, like iOS devices T2 don't accept downgrades and the official Mojave don't have this package yet. Try this:

• Install Catalina on the Mac that you gonna run Apple Configurator,
• install the Catalina Developer Profile (maybe the Public Beta will work too, if you don't have access to the ADC),
• reboot,
• open Apple Configurator and then try to do the restore.

P.S: you probably need to do this before DP6 is released.

The Mac that I am attempting to restore from is also on DP5. With the developer profile installed. When Apple configurator 2 retrieves the restore image, it's retrieving the current release version.

I think I am basically stuck until there is an equivalent or newer version available on the restore repo. The package doesn't contain an IPSW and Catalina installer does not as well. I think IPSW is only used when restoring and not for installing the firmware in the first place. I was hoping the .pkg contained the restore image but does not appear so.

 

[bogdanw]

The package doesn't contain an IPSW and Catalina installer does not as well.

Inside EmbeddedOSFirmware.pkg from InstallESD.dmg Catalina are some DFU files: iBEC.x619.RELEASE.im4p and iBSS.x619.RELEASE.im4p