MacOS: Black screen, with apple logo and stuck progress bar right after logging in.

Do you have Time Machine backups from before the upgrade? If so, I would do a full erase & reinstall, then restore from a backup:

https://support.apple.com/guide/mac-help/erase-and-reinstall-macos-mh27903/mac

Guessing and maybe some Senior Contributor will pickup you question and have more insights.

Thinking >>

1 - Internal Drive has run out of Available Disk Space to continue to boot and perform normally

2- Were there any Third Party Software installed before the update. Are there any AntiVirus, Disk Cleaner, Optimizers, Un-installers, etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation. The Built-in Security of Big Sur is all that is required.

User wrote " my M1 MacBook Air from 11.0 to 11.6 " and how exactly was this attempted.

Notation - Big Sur 11.0, as per quotation from posting, was Released sometime in November 2020 and was very quick updated to 11.1

So, attempting to move from the Original Release of 11.0 to the latest will required steps between 11.0 to reach 11.6.

In fact, the Apple Store , asI am writing this reply, is Only Offering the 11.5.2 at the last available Full Installer

From what has been seen on these Forums - the Big Sur 11.5.2 is a requirements to be installed before the 11.6 will be permitted to be installed via Software Update Application in System Preferences.

Then restart the computer in normal method.

Does it boot normally ??

Hi I’m having the same problem we’re u able to fix it by any chance?