March security update?

The update for the N975U1 is firmware N975U1UES3BTB3, security-only (March 1), with a new bootloader version (so you can't downgrade to an earlier firmware version after you've installed BTB3).

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AT&T Note10 Plus Firmware Build N975USQS3BTB6 March Security patch, bootloader does upgrade from v2 to v3.
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My Note 10+ just updated on Verizon in Arizona. I had checked earlier today but no update at noon. Tonight at 10pm, got it!
 
last time I flashed AT&T note 10 plus I kept getting unauthorized software has been flashed on this device and this device is now locked messaged. not looking to flash again unless I did something wrong?
 
last time I flashed AT&T note 10 plus I kept getting unauthorized software has been flashed on this device and this device is now locked messaged. not looking to flash again unless I did something wrong?

Yup most likely you did something wrong, cause that is and Official firmware. I posted above.