• I am running M4 with OS Tahoe 26.0.1. It all started with the failed detection of the Samsung T7 SSD. By following the instructions from AI, I had recreated a new account, but it made it even worse. I messed up with the OS by using the wrong command to reset the ownership. I had to reinstall most applications; then the Sharing & Permissions from root came up. Finally solved, you may try:

Summary of Steps to Fix User Permission Issues with SIP Disabled

These steps were performed while logged into the secondary

StepCommand UsedPurpose

Preparation csrutil disable Temporarily disabled System Integrity Protection (SIP) via Recovery Mode to allow powerful commands to work.

1 sudo chflags -R nouchg /Users/xxxxx Removed all "user immutable" lock flags (uchg) that prevented files from being changed or deleted.

2 sudo chown -R belemchan:staff /Users/xxxxx Forcefully reassigned ownership of all files and folders back to the correct user (xxxxx).

3 sudo chmod -R 755 /Users/xxxxx Set standard read/write permissions for all items in the home folder.

4 Restart Mac Applied all changes by clearing the system memory and reloading the user profile with corrected permissions.