Bit-Locker protected Flash drive becomes read only

I use Flash drives protected by Bit-Locker to save some confidential information.

Now I have a problem:

The drive can be unblocked by entering the password, no problem, and the information can be read.

But is it read-only, no information can be written to it. The error message says the drive is protected against writes.

This began to happen a few days ago, after the last Windows 11 update.

I appreciate any ideas to solve this.

Does it work on another computer?

1. It may have an incorrect read-only flag. Run diskpart:

2. Or the USB's flash controller has detected cell errors, and locked the drive from new writes. You can read old files, but Windows won't risk you writing new or updated data to it.