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Version 10.1 by Drunk Monkey on 2021-11-03 09:34
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1 {{box cssClass="box floatinginfobox" title="**Quick Links**"}}
2 {{toc start="2" depth="5" numbered="true"/}}
3 {{/box}}
4
5 == Downgrade Big Sur (11.x) to Catalina (10.15) via an 11.x Host Computer ==
6
7 {{warning}}
8 These instructions will completely erase the files on computer you are installing to with no chance of recovery. Make sure you have backed up and saved everything you need before you start this process.
9
10 We will also use and erase the USB drive we will use to create the install media. Again, make sure it doesn't contain anything valuable before you start.
11 {{/warning}}
12
13 1. Start with a 16GB USB drive. This USB will be erased. In our example, the USB is labelled "MyVolume"
14 1. Download the Catalina installer for 10.15 ( [[https:~~/~~/support.apple.com/en-in/HT201372>>https://support.apple.com/en-in/HT201372]] ) from the apple app store (8GB). After downloading, the OS will try to run the installer and fail giving an error message. Just dismiss the dialog window and continue on.
15 1. Run "createinstallmedia" via the terminal window to create the installer:
16 11. ##sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia ~-~-volume /Volumes/MyVolume##
17 [[image:macos-big-sur-terminal-create-bootable-installer.jpg]]
18 11. Eject the installer USB
19 11. Insert the installer USB into the computer and power it on while holding the Option key pressed until the boot selection screen appears:
20 <screenshot>
21 11.
22
23 ====== ~[[[top>>doc:WebHome]]] ======
24
25 == Disable MacBook Pro Dedicated GPU ==
26
27
28 Important Notes:
29
30 * I have recently come up with a MUCH better, PERMANENT solution to this issue, which I'd recommend using instead, if your AMD GPU has failed. This method will also allow brightness control and sleep mode to continue working as normal. More info can be found [[here>>url:https://doslabelectronics.com/Demux]].
31 * After performing the steps below, sleep mode and brightness control will NOT work properly on your system.
32
33 1. First, ensure your machine is completely shut down (You can press Control + Option + Shift + Power keys to reset the SMC).
34 1. Now, boot your machine while holding the Command + S keys. As the system boots, it should display white text on a black screen, and should eventually stop at a prompt.
35 1. At this prompt, enter the following command and press Return: 
36 ##nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00##
37 1. Next, enter reboot,  and press Return.
38 1. Immediately after running the reboot command, hold down Command + R (if you're running OS X 10.11 or later) to boot into Recovery Mode. If you don't have a Recovery Partition, you can boot from a Mac OS installer USB drive.
39 1. Once booted in Recovery Mode, open Terminal, and run the following command:
40 ##csrutil disable##
41 1. Reboot the system.
42 1. Once the system reboots, it should now successfully boot into your install of OS X. Now, you'll need to download the program found [[here>>url:http://dosdude1.com/apps/MacBook%20Pro%20dGPU%20Disabler.zip]].
43 1. Run the program, follow the prompts, and enter your password when prompted.
44 1. Once the tool finishes running, your system should now run without the dedicated graphics, and should work completely normally.
45
46 ====== ~[[[top>>doc:WebHome]]] ======
47
48 == Essential Keyboard Shortcuts for Mac ==
49
50 (% class="min" %)
51 |=Shortcut|=Action
52 |**Startup Shortcuts**|
53 |C|Boot from Optical Drive
54 |D|Boot to Apple Diagnostics
55 |N|Boot from a network server
56 |T|Boot in Target Disk Mode
57 |Shift|Boot in Safe Mode
58 |Cmd + R|Boot to macOS Recovery
59 |Option + Cmd + R|Boot to macOS Recovery over the internet
60 |Cmd + S|Boot in Single-User Mode
61 |Cmd + V|Boot in Verbose Mode
62 |Option|Boot to Startup Manager, to pick other startup disks if available
63 |Cmd + Option + P + R|Reset NVRAM or PRAM
64 |Shift + Control + Option|Reset SMC
65 |F12 or trackpad button|Eject removable media
66 |Left Shift|Disable automatic login (if enabled)
67 |Shift|(at login screen) Prevent Login items / Previous Windows
68 |**Global Shortcuts**|
69 |Shift + Cmd + 3|Take screenshot of entire screen
70 |Shift + Cmd + 4|Take screenshot of selected area
71 |Shift + Cmd + 4, then Space|Take screenshot of selected window
72 |Cmd + A|Select all
73 |Cmd + F|Find
74 |Cmd + H|Hide current window
75 |Option + Cmd + H|Hide all other windows
76 |Cmd + M|Minimize current window
77 |Option + Cmd + M|Minimize all windows
78 |Cmd + W|Close current window
79 |Option + Cmd + W|Close all windows
80 |Cmd + O|Open
81 |Cmd + P|Print
82 |Cmd + S|Save
83 |Cmd + C|Copy
84 |Cmd + V|Paste (copy)
85 |Option + Cmd + V|Paste (cut) i.e. move copied item to current location
86 |Shift + Option + Cmd + V|Paste and match style
87 |Cmd + Z|Undo
88 |Cmd + ?|Help
89 |Cmd + , (Comma)|Open Preferences for current app
90 |Cmd + Space|Open Spotlight search
91 |Cmd + Tab|Switch to the next open app
92 |Cmd + ~~ (Tilde)|Switch to the next window in the current app
93 |Control + Cmd + Q|Lock the screen
94 |Shift + Cmd + Q|Log out
95 |Option + Shift + Cmd + Q|Log out instantly
96 |Cmd + Option + Esc|Force quit
97 |Cmd + Option + Eject|Activate Sleep mode
98 |Shift + Control + Eject|Put display(s) to sleep
99 |Cmd + Control + Eject|Quit all apps and restart
100 |Control + Eject|Choose from Sleep, Restart, and Shutdown options
101 |**Finder Shortcuts**|
102 |Enter|Rename selected file or folder
103 |Space|Open preview of selected file
104 |Option + Space|Open preview of selected file in fullscreen mode
105 |Shift + Cmd + G|Go to folder...
106 |Shift + Cmd + N|Create new folder
107 |Shift + Cmd + Delete|Empty the Trash folder
108 |Option + Shift + Cmd + Delete|Empty the Trash folder immediately
109 |Cmd + 1|Icon View
110 |Cmd + 2|List View
111 |Cmd + 3|Column View
112 |Cmd + D|Duplicate selected file or folder
113 |Cmd + I|Get info
114 |Cmd + J|View options
115 |Cmd + N|Open new Finder window
116 |Cmd + T|Open new Finder tab
117 |Cmd + [|Back
118 |Cmd + ]|Forward
119 |Cmd + Delete|Move selected item(s) to Trash
120 |Cmd + Up|Move up one folder
121 |Cmd + Down|Move down one folder
122 |Cmd + Option + I|Show Attributes Inspector
123 |Cmd + Control + N|With files selected, create a new folder and immediately move selected files into that folder
124
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