29 Replies
      Latest reply on Sep 21, 2019 6:55 AM by Kdusdee
      Alex4224 Level 1 Level 1 (0 points)

        Hello everyone.

        I wanted downgrade Catalina to Mojave. What I've done:

        1. I created Mojave bootable flash.

        2. Enter to recovery mode and erase main disk.

        3. Next restarted Mac to boot from the flash.

        But system did't boot from flash. The system offered to "Starting Internet Recovery" from the WIFI. After the download progress reached 100%, the system showed icon with exclamation mark and message "apple.com/support -9000F". Now Mac does't boot from a any external drive, does't started in Recovery mode, I used ⌘-R and Option-⌘-R and Shift-Option-⌘-R and Options for select boot disk but Mac over and over again downloads something from the Internet and shows this error over and over again. I'm have a serious problem what should I do?

        • Re: How to kill mac - Downgrade Catalina to Mojave
          luniacdevel Level 1 Level 1 (20 points)

          What model mac do you have?

           

          Is it one with the T2 chip?

          • Re: How to kill mac - Downgrade Catalina to Mojave
            xxu Level 1 Level 1 (0 points)

            I have exactly the same issue with my macbook pro 13" 2018.

             

            I heard that this "-9000F' error is because Apple only have recovery server for released OS -- and of cause there is no server for Catalina. That means if I patient enough and wait after Catalina release in September, I should able to recover my macbook from brick by Network Recovery?

             

            I have another macbook to finish my daily work so I'm not in a hurry, but just not sure to bring my bricked macbook to repair or just wait...

            • Re: How to kill mac - Downgrade Catalina to Mojave
              SheehabX Level 1 Level 1 (0 points)

              Same problem here. Cant do anything. should I wait for final release of catalina or what?

              • Re: How to kill mac - Downgrade Catalina to Mojave
                kewal_codes Level 1 Level 1 (0 points)

                I got this error 9000f yesterday and fortunately I was able to fix it by booting into recovery mode using Cmd ⌘ + R and re-installing MacOS Catalina Beta.

                 

                What did I do?

                I installed MacOS Caltalina on my 2018 MacBook Pro with T2 security chip, used it for about 2 weeks and then decided to go back to Mojave because some of the programs that I use for Web development and photo editing stoppped working correctly.

                 

                How I killed my MacBook Pro?

                I did not read any downgrade procedure and just booted into recovery and used disk utilities to wipe the SSD. I didn't know that with T2 security chips, you have to enable external drive boot or else you almost brick your laptop.

                 

                How I was able to get rid of error 9000f?

                • With a freshly wiped SSD and no option to boot using any external drives, I decided to go with internet recovery by pressing Cmd + Shift + R which then asked me to connect to a WiFi, downloaded some stuff with the spinning globe on the screen, then straight away gave me the 9000f error.
                • I also tried using Cmd + Option + R to boot into recovery but got the same error again.
                • Then I tried using just Cmd ⌘ + R combination while booting up and somehow this time I was able to get to the installation screen that only allowed me to install Catalina Beta (which is okay instead of having a bricked laptop and a possible trip to the Apple store).
                • Bottomline, if you're getting error 9000f, the only way ressurect a bricked MacBook Pro with a T2 security chip is to re-install MacOS Catalina Beta.
                • Re: How to kill mac - Downgrade Catalina to Mojave
                  rfmfp Level 1 Level 1 (0 points)

                  Same happened to me! I was updating macOS Catalina and always got stucked at 26 minutes. Was able to enter internet recovery mode through cmd + option + R (cmd + R gave me 9000F error), download again macOS Catalina beta, and try to reinstall it. Got again stucked at the 26 minutes. Anyone else?

                    • Re: How to kill mac - Downgrade Catalina to Mojave
                      Ibrasau Level 1 Level 1 (0 points)

                      Nope, you're lucky to even have anything different of that 9000F error, I couldn't get rid of it no matter what combination of keys I hold.

                      • Re: How to kill mac - Downgrade Catalina to Mojave
                        hotpaw2 Level 2 Level 2 (95 points)

                        I got the 9000F error when trying a cmd option shift R Mojave downgrade from Catalina beta as well.. 

                         

                        To get rid of the error, I connected the MacBook Pro with T2 to a wired Ethernet connection via a USB dongle.  That allowed me to use Disk Utility and enter enough passwords to erase the SSD during a command R recovery mode reboot.  That then allowed me to recover factory Mojave after another cmd option shift R recovery mode reboot.

                         

                        The key, after hours of trying, was to use a wired network connection (to Apple servers) instead of WiFi.

                      • Re: How to kill mac - Downgrade Catalina to Mojave
                        Josuecocoman Level 1 Level 1 (0 points)

                        The solution is :

                         

                         

                        1-Another Mac PC with OSX Catalina Beta

                        2- Or go to https://developer.apple.com/account/ and upgrade to another mac to Catalina Beta

                        3-From this OSX you can download the .app of catalina Beta

                        4-Create USB with the command in this web

                        5-http: //osxdaily.com/2019/06/06/make-macos-catalina-beta-usb-boot-install-drive/

                        6-Start the PC with option

                        7-Install from the USB

                        • Re: How to kill mac - Downgrade Catalina to Mojave
                          Josuecocoman Level 1 Level 1 (0 points)

                          The solution is :

                           

                           

                          1-Another Mac PC with OSX Catalina Beta

                          2- Or go to https://developer.apple.com/account/ and upgrade to another mac to Catalina Beta

                          3-From this OSX you can download the .app of catalina Beta

                          4-Create USB with the command in this web

                          5-http: //osxdaily.com/2019/06/06/make-macos-catalina-beta-usb-boot-install-drive/

                          6-Start the PC with option

                          7-Install from the USB

                          • Re: How to kill mac - Downgrade Catalina to Mojave
                            marioorellana Level 1 Level 1 (0 points)

                            For whoever reads this, take it to an apple store and set it next to a display macbook or a place where you can entertain yourself while this process is happening. It will take a while . When you're there, open your laptop and hold "option, command, R" on the keyboard and turn it on. You will enter internet recovery mode. Connect it to the apple store network. It may fail once or twice but I kept trying and it eventually worked. I came in to get it inspected but the wanted me to wait 3 hours because they wanted to replace the logic board. That sounded expensive to me so I just did the internet recovery there by myself. Im running MacOS Catalina. DO NOT get your macbook inspected without trying this method first. It might work for you. I tried this at home and nothing would work. My WiFi connection is stable but it seems that apples in store wifi is much more stable so i recommend trying it in one.

                              • Re: How to kill mac - Downgrade Catalina to Mojave
                                Haluska Level 1 Level 1 (0 points)

                                marioorellana's process is pretty much what worked for me.

                                 

                                Yesterday, I spent a couple of hours with apple supprt at the store. They had managed to wipe my drive, which I wanted done, and were in the process of restoring Catalina as we couldn't get it operational with any other OS. It was taking too long and I had to go. When I tried to resume the process at my house it would not work.

                                 

                                This morning I saw Mario's post and I realized my problem might be me trying to use WiFi (Thank you, Mario!). I plugged in to my ethernet and tried a few key combinations. I'm sure it was just the repitition that worked and not the specific combo. OPT + CMD + R is was is what I used. But I tried each of them a few times before it worked. Just be patient.

                                 

                                Also, I selected fresh install of Catalina and after it was all up and running I used the Migration Assistant to do a complete restore from a Time Machine backup from a USB C SSD.

                                  • Re: How to kill mac - Downgrade Catalina to Mojave
                                    vicbod Level 1 Level 1 (0 points)

                                    Confirmed for me too, i had the same problem, after many try it worked, with the wifi.

                                     

                                    Be patient and repete the process until it work !

                                      • Re: How to kill mac - Downgrade Catalina to Mojave
                                        j0rn Level 1 Level 1 (0 points)

                                        I'm in a new place now, by which I mean my MBP is no longer stuck on "26 minutes remaining" and now says "Estimating time remaining...". Should I just wait several more hours?

                                          • Re: How to kill mac - Downgrade Catalina to Mojave
                                            AndyMck Level 1 Level 1 (0 points)

                                            All - I have the fix - confirmed with two rebuilds.

                                            All you have to do is reset the PRAM twice. Then it will rebuild from either WiFi or Ethernet.

                                            I did this after visiting an Apple Store - then again tried at home.

                                            Apparently its the machine remebering the last OSX.

                                            This was on a Macbook Pro 2018.

                                             

                                            After PRAM reset - then Option,Command R.

                                            The timer should show approx 14 mins (If it shows 5 or less it fails to 9000F).

                                            Hope this helps you.

                                              • Re: How to kill mac - Downgrade Catalina to Mojave
                                                rishimd Level 1 Level 1 (0 points)

                                                I can confirm this works on my 2018 MacBook Pro with touchbar.

                                                 

                                                Problem: Catalina beta 5 (File Vault enabled, did not allow booting from external drive) -> Recovery Mode -> Wiped main SSD -> tried using a Mojave USB to reinstall MacOS Mojave, but the system wouldn't boot. It kept reverting to the Internet Recovery. Option-Command-R and Shift-Option-Command-R (both on WiFi connectivity) presented error 1008F after 5-10 minutes.

                                                 

                                                At this point, nothing worked. I didn't even care about downgrading... I just wanted to boot into SOMETHING.

                                                 

                                                Solution: Shutdown, power on, immediately after powering on holding command-option-p-r until the Apple logo disappeared and reappeared. After it reappeared, I shut down the computer manually and repeated the entire process again (reset PRAM twice). Shutdown again. On the next restart, I held down option-command-R hoping the result would be different, and it was! No error 1008. Although AndyMck mentions that the time should show ~14 minutes, mine showed 6 minutes. It launched into recovery where I reinstalled MacOS (in this case, Catalina beta 5).

                                                 

                                                *Whew*

                                                  • Re: How to kill mac - Downgrade Catalina to Mojave
                                                    mmm200 Level 1 Level 1 (0 points)

                                                    My take on it:

                                                    If Catalina Beta is installed on T2 equiped Macbook Pro then your T2 running 4.0 Beta version.

                                                    Do (!!!) NOT (!!!) try to boot in DFU mode to wipe everything and get back to Mojave. Freaking Configurator 2 (used 2.9 and 2.10 Beta) always trying to downgrade T2 firmware to version 3.6 and it will BRICK the laptop. After first try it will boot in Recovery mode (not DFU) and you will be bringing the laptop to Apple Store for repair. Tried on 2 Macbook Pro's 15 2018.

                                                    • Re: How to kill mac - Downgrade Catalina to Mojave
                                                      joihoino Level 1 Level 1 (0 points)

                                                      This is what worked for me. Months ago I installed Catalina b2 in its own apfs container allowing for a Mojave/Catalina dual boot and later deleted it. I then reset the SMC and PRAM due to unrelated issues which re-enabled SIP and no booting from an external drive. I wanted to do a clean reinstall of Mojave but couldn’t boot from usb and couldn’t access recovery. I was getting error 9000F. I removed my MBP from my iCloud account but still got 9000F. Ended up resetting the PRAM twice and was greeted with macos recovery to install Catalina beta.

                                              • Re: How to kill mac - Downgrade Catalina to Mojave
                                                Kdusdee Level 1 Level 1 (0 points)

                                                Confirm for error 1008f plugged into ethernet work for me to load macos recovery to install Catalina beta.