macos – Mac stuck at boot after installing Big Sur 11.3

I just tried installing Big Sur 11.3 from Catalina, on a 2020 Macbook Pro.

Here’s what I tried so far:

  • Installed Big Sur via Software Update, everything went like normal until progress bar reached 90%
  • After 4 hrs, progress bar still stuck at 90% with black screen and Apple logo
  • Force shutdown then turn on again
  • Login screen showed up in a Big Sur UI
  • Entered password, proceeds to the same black screen and still stuck at 90% progress bar
  • Waited for an hour, so I forced restart again
  • Booted to recovery mode (cmd+R) and ran First Aid on all volumes, then containers, then disk (as per Apple support page)
  • Restarted, still stuck at 90% progress bar
  • Booted to recovery mode again and reinstalled Big Sur
  • Left it to install overnight, again still stuck at 90%
  • Repeated all steps above (normal restart, restart to recovery + first aid) but same thing
  • Reset NVRAM
  • Booted to Safe mode

On safe mode, after logging in with my user password, it asked me to create a new macOS user (along with the language, terms, apple ID etc like when setting up a brand new Mac).

I went ahead and setup a new user, safe mode booted successfully with a working Big Sur macOS. My old files were still intact when I checked the original user’s directory using the terminal (since currently in safe mode all folders are empty since it’s a new user.)

So in summary:

  • Big Sur upgrade (from Catalina) didn’t complete properly
  • I am able to safe boot to Big Sur but only with a newly created user
  • It might be a startup issue on my original user

Any suggestions on what I should do next? My last resort would be to backup my files on an external HD using the safe boot, then do a fresh install, wiping my disk.

Any help would be appreciated. Thank you!

EDIT: Currently trying out internet recovery mode to downgrade and reinstall Catalina.

EDIT 2: When trying to reinstall Catalina, there are no available disks to choose from when it asks me where to install macOS.

cryptography – HMAC SHA256 implementation in Mathematica 11.3

I need a HMAC SHA implementation for Mathematica for an API authentication. I am not experienced at all in cryptography, hash functions, and HMAC. So far what I found is this:

hmac[key_, message_] := 
 Module[{keyLen = StringLength[key], dkey, opad, ipad, blocksize = 64,
    method = "SHA"}, 
  dkey = If[keyLen > blocksize, IntegerString[Hash[key, method], 16], 
    StringPadRight[key, blocksize, FromCharacterCode[0]]]; {opad, 
    ipad} = FromCharacterCode[
        StringRepeat[FromCharacterCode[FromDigits[#, 16]], blocksize],
        ToCharacterCode@dkey]] & /@ {"5c", "36"};
      IntegerDigits[Hash[StringJoin[ipad, message], method], 256], 
      "Binary"]], method], 16]]

But using the examples from Wikipedia, it returns wrong results. With

hmac[“key”, “The quick brown fox jumps over the lazy dog”]

I get the result: c0af2d1bc1449a4d4e239af0012d8d183d639fcc. The correct output should be de7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9.

Could anyone on advise on what is wrong? Also, what are modifications that I will need to make to turn this into SHA256 from SHA1?

install – Big Sur 11.3 : rebuild the index of all installed Macport packages

Following a lot of error messages when I wanted to install a Macport package on my new MacOS book pro Big Sur 11.3, and having no problem on another MacBook with Big Sur 11.3 also, I decided to do a “raw” copy of the directory /opt/local from the working MacBook to the first one with which I have problems.

Now, I would like to rebuild an index of all Macport packages copied on the new MacBook.

Indeed, if I want to install a Macport package, I get :

sudo port search listofitems
Error: Current platform "darwin 20" does not match expected platform "darwin 19"
Error: If you upgraded your OS, please follow the migration instructions:
OS platform mismatch
    while executing
"mportinit ui_options global_options global_variations"
Error: /opt/local/bin/port: Failed to initialize MacPorts, OS platform mismatch

Have I to copy an index file from the working Macport installation of other MacBook on the new one ? I didn’t find such a file.

As you can see above in the error messages, there seems to be a problem of platform :

Error: Current platform "darwin 20" does not match expected platform "darwin 19"

Please, if someone could help me to rebuild the new packages installed, rather copied in a raw way, but I hope this is possible to get this current index file.

Any help would be fine.

big sur – Reinstall python 2.7.16 librairies on MacOS Big Sur 11.3

To confirm results of a colleague who has coded an interpolation with Cubicspline from scipy with python2 , I have to import CubicSpline function. I know python2 is deprecated but this is just for a validation.

But when i do a :

from scipy.interpolate import CubicSpline

I have systematically the error message :

ImportError: cannot import name CubicSpline

So, I tried to install it with pip-2.7 by doing :

curl -o


and after from the directory ~/Library/Python/2.7/bin :

./pip2.7 install scipy

but same error, CubicSpline is not found

I have the version :

$ which python2.7

So python2.7 is the default python2 of the system.

How to install CubicSpline library on the default installation of python2.7 in the OS ?

Have I got to reinstall all the python2.7 framework ? and if yes, how to perform it ?

hard drive – Can’t free up purgeable space in macOS 11.3

I’ve ran into this problem where my external Thunderbolt volume, which is formatted with encrypted APFS is not letting me free up any space, regardless of what I do.

When I first noticed, I manually went in and moved about 100GB from the drive in question to another location in order to free up space. However, when I went to save new stuff to the volume, it once again complained it was out of space.

This is what’s being reported in DaisyDisk:


This is what df reports:

Filesystem       Size   Used  Avail Capacity iused       ifree %iused  Mounted on  
/dev/disk3s1    1.8Ti  1.8Ti   39Mi   100% 2603571 19530493869    0%   /Volumes/2bigRAID

If I run du on the disk, it reports a total of 880G (the disk is 2TB).

I’ve tried the following:

  1. Used the CleanMyMac “Clean purgeable space” feature
  2. Rebooted in recovery mode and ran First Aid on the disk
  3. Made sure trashes are empty

All to no avail. I can’t add any new files to this disk. I’m borderline considering making a copy of everything to another drive, re-formatting this one and then moving things back. But, it’s an SSD and I’d rather avoid the unnecessary write cycles if there’s something else I haven’t considered.

bug – YouTube on Safari Very Stuttery After 11.3

bug – YouTube on Safari Very Stuttery After 11.3 – Ask Different

plotting – ContourPlot and MeshFunctions issue between versions 11.3 and 12.0

On Mathematica 11.3

This code produces the image below (a set of points that I am then using as a pattern for FindRoot):

IIges(x_, y_) := Sin(x)^2 + Sin(y)^2;
xm = 4;

{dx(x_, y_), dy(x_, y_)} = D(IIges(x, y), {{x, y}}); 
ContourPlot(dx(x, y) == 0, {x, -xm, xm}, {y, -xm, xm}, 
 ContourStyle -> None, Mesh -> {{0}}, 
 MeshFunctions -> Function({x, y, z}, dy(x, y)))

enter image description here

On Mathematica 12.0

The same code produces nothing ! Why??

enter image description here

magento2 – failed to open stream: Too many open files in vendor/magento/framework/App/DeploymentConfig/Reader.php on line 113

I have a magento 2.3.x, after server restart, it shows the errors when i visit the homepage, any one know what is the problem?

Warning: include(/home/m2/public_html/app/etc/config.php): failed to
open stream: Too many open files in
on line 113

Warning: include(): Failed opening
‘/home/m2/public_html/app/etc/config.php’ for inclusion
on line 113

Fatal error: Uncaught MagentoFrameworkExceptionRuntimeException:
Invalid configuration file: ‘/home/m2/public_html/app/etc/config.php’
Stack trace: #0
MagentoFrameworkAppDeploymentConfigReader->load() #1
MagentoFrameworkAppDeploymentConfig->load() #2
MagentoFrameworkAppDeploymentConfig->get() #3
MagentoFrameworkAppObjectManagerFactory->create(Array) #4
‘/home/m2/public…’, Array) #5
MagentoFrameworkAppBootstrap::creat in
on line 115

App Mac – Motion Weather 4K – Ultra HD 1.1.3 macOS | NulledTeam UnderGround

File size: 743 MB

Introducing Motion Weather 4K: The most insanely beautiful and innovative weather application ever conceived.​

Motion Weather 4K turns your Wallpaper into breathtaking Cinema quality 4K video based on the Weather conditions outside – and is an excellent weather application in it’s own right. Motion Weather 4K also “knows” when it’s day and night and automatically switches to night 4K videos when it’s night outside!
Main features:

– Automatically changes your Wallpaper based on conditions outside in stunning 4K Ultra HD Video

– Knows when it’s Day or Night and changes 4K Videos accordingly

– Add up to 30 Desklets to your Desktop allowing full customizability over position, size, font, foreground color, and background color

– Optionally set Desklets to be automatically added and customized for each Theme as the Wallpaper changes

– Choose a Custom 4K Video with Graphical Theme Chooser, turning off automatic Wallpaper updates

– Super efficient Video Player foundation can play full 4K videos while averaging 5% CPU per display

– Main Weather window matches with Wallpaper background

– Works for hundreds of thousands of locations worldwide

– Unlimited Display support

– Unlimited Multiple Locations

– Weather data updates every 15 minutes

– Switch Locations instantly from the Locations Menu

– Incredibly advanced, yet super easy to use

macOS 10.9 or later 64-bit


¿Cómo importar el “mysql-connector-java-8.0.21” en Apache NetBeans 11.3 y conectarse a la Base de Datos MySQL de “phpMyAdmin”?

Vengo de la versión 8 de NetBeans ID, y en ésta nueva versión “Apache NetBeans 11.3” es muy diferente. Comencé un proyecto que requiere conexión a Base de Datos y lo primero que iba hacer cuando cree mi proyecto es importar el conector, pero ya no está la carpeta “Libraries” que es donde se importaba el conector. Soy nuevo con este Apache Netbeans y no se como importar el connector.

introducir la descripción de la imagen aquí

Ojala y me puedan ayudar con ésto, y tampoco se como usar el Databases que supongo yo es para conectar la BD. Ahí me pide usuario y contraseña pero phpMyAdmin no tiene contraseña y no lo puedo dejar en blanco.

introducir la descripción de la imagen aquí

Disculpen mi ignorancia, pero no se si todo esto sea el usuario:
introducir la descripción de la imagen aquí

Por favor, necesito ayuda.

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