I can't uninstall brew on MacOS Apple Silicon - macos

Question

Like it is mentioned here https://docs.brew.sh/FAQ#how-do-i-uninstall-homebrew I typed
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/uninstall.sh)" but it doesn't seem to work...
When I type afterwards which brew it returns /usr/local/bin/brew
and when I type again /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/uninstall.sh)"
It displays :
/bin/bash: line 236: /opt/homebrew/bin/brew: No such file or directory
Failed to locate Homebrew!
So I don't know what to do to uninstall brew.
My ultimate goal is to not getting this error when I try to install a brew package :
Error: Cannot install in Homebrew on ARM processor in Intel default
prefix (/usr/local)! Please create a new installation in /opt/homebrew
using one of the "Alternative Installs" from:
https://docs.brew.sh/Installation You can migrate your previously
installed formula list with: brew bundle dump
I now have a Mac with Apple Silicon but I used to have a Intel Mac.
EDIT 1 : I took a quick look at the uninstall.sh script here https://raw.githubusercontent.com/Homebrew/install/HEAD/uninstall.sh
It seems that my problem is induced by my os installation because I did it from an Intel-based MacOS time machine backup. The problem is the uninstall.sh script is programed to uninstall homebrew according to the current os. So this script can only uninstall the ARM homebrew that I need and can't uninstall the Intel homebrew I try to get rid of...
Maybe I should try to just change the line of code that detect I have a ARM CPU to make the script think I have a Intel-based Mac but I don't know if it could bring chaos in my computer...
I'm surprised there's not a lot of answers about this problem since I don't think I'm the only one to have switched from Intel-based Mac to ARM-based Mac with Time Machine.
EDIT 2 : I tried to uninstall Homebrew with a command of my own arch -x86_64 ./uninstall_brew.sh (I have no idea if it's not DANGEROUS) but I don't know if it worked well...
Here is the output of the command :
user#MacBook-Pro % arch -x86_64 ./uninstall_brew.sh
Warning: This script will remove:
/Users/user/Library/Caches/Homebrew/
/usr/local/Caskroom/
/usr/local/Cellar/
/usr/local/bin/brew -> /usr/local/bin/brew
Are you sure you want to uninstall Homebrew? This will remove your installed packages! [y/N] y
==> Removing Homebrew installation...
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
/usr/local/share/info/dir: Permission denied
Warning: Failed to delete /usr/local/Caskroom
rm: /usr/local/Caskroom: Permission denied
Warning: Failed to delete /usr/local/Cellar
rm: /usr/local/Cellar: Permission denied
==> Removing empty directories...
Password:
==> /usr/bin/sudo /usr/bin/find /usr/local/bin /usr/local/etc /usr/local/include /usr/local/lib /usr/local/opt /usr/local/sbin /usr/local/share /usr/local/var /usr/local/Caskroom /usr/local/Cellar /usr/local/Homebrew /usr/local/Frameworks -name .DS_Store -delete
==> /usr/bin/sudo /usr/bin/find /usr/local/bin /usr/local/etc /usr/local/include /usr/local/lib /usr/local/opt /usr/local/sbin /usr/local/share /usr/local/var /usr/local/Caskroom /usr/local/Cellar /usr/local/Homebrew /usr/local/Frameworks -depth -type d -empty -exec rmdir {} ;
==> Homebrew uninstalled!
The following possible Homebrew files were not deleted:
/usr/local/.com.apple.installer.keep
/usr/local/Frameworks/
/usr/local/Homebrew/
/usr/local/bin/
/usr/local/etc/
/usr/local/git/
/usr/local/include/
/usr/local/lib/
/usr/local/man/
/usr/local/opt/
/usr/local/remotedesktop/
/usr/local/sbin/
/usr/local/share/
/usr/local/var/
You may wish to remove them yourself.

Answer 1

Try running: PATH=/usr/local/bin:$PATH arch -x86_64 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/uninstall.sh)"
Found the answer here: https://github.com/Homebrew/discussions/discussions/3437

Answer 2

I encounter similar issue on my M1 MBP, and I found that changing the uninstall path in the script may work.
First, I download a local copy of the uninstalling script
curl -O https://raw.githubusercontent.com/Homebrew/install/HEAD/uninstall.sh
Then run the script locally and set the path to /user/local(which is the default path of homebrew on intel Mac)
/bin/bash uninstall.sh --path=/usr/local
but it completed with 2 warnings I'm not sure what they are
Warning: Failed during: /usr/bin/sudo rmdir /usr/local
Warning: Homebrew partially uninstalled (but there were steps that failed)!
To finish uninstalling rerun this script with `sudo`.
The following possible Homebrew files were not deleted:
/usr/local/Cellar/
/usr/local/Frameworks/
/usr/local/Homebrew/
/usr/local/bin/
/usr/local/etc/
/usr/local/include/
/usr/local/lib/
/usr/local/opt/
/usr/local/sbin/
/usr/local/share/
/usr/local/texlive/
/usr/local/var/
You may wish to remove them yourself.
Either way, I delete those files manually.
(This is my first time to answer something on stack overflow. Hope this help!)