MBP( mid 2015, OS Monetary 12.71.1) restarting in loops and comes back in user login page. safe mode not coming up. Force switch on with recovery keys not helps.

After internet recovery was present/ active Apple ID, a window of Recovery Asst appears with a msg something like ‘trying to access file vault disk’ or so. Then after a min following msg appears

“The supplied iCloud account was unable to unlock this volume.”

Also seen stopping at other boot up screens like —

sometimes shows a url like support.Apple.com/startup

or

stopped spinning globe with an alert Or exclamation symbol on top

or

a cross line on circle ( like a stop symbol)

Changed battery today ( old one bulged) with gd hope. But same issue. It’s definitively a Sw issue.

wanted to save my data. Should I recover using Time Machine now? Or it will damage that data also since Sw or Os has issue ?

Im kinda devastated.

Thanks for ur serious guidance.