Security Updates not working

[Scotophor]

I have an S23 Ultra, U.S. model (SM-S918UZKFXAA) bought used and unlocked. I'm in California on Tello MVNO (under T-Mobile). My phone's settings say "Security patch level: July 1, 2024" and that it's up-to-date, which I'm sure is not true. I can't get the security patch to update.

I've read other posts here saying to power off the phone, remove the SIM card, restart, and try to update without the SIM. That hasn't worked. I also read to try another SIM but I don't have another SIM available.

Is there any other method to get a reluctant phone to update its security patch?

[meself]

Smartwatch i think the app is called seen mentioned to help

[3Fees]

Samsung Smart Switch. Connect your phone through usb cable to pc with Samsung Smart Switch installed on pc and then check for updates.

Cheers
3Fees

[Scotophor]

Check for updates through the phone's Settings like normal?

[3Fees]

Look here :

https://www.samsung.com/ae/support/mobile-devices/how-to-update-software-using-smart-switch/

Cheers
3Fees

[Scotophor]

Oh, it's a feature inside the Smart Switch app. Thank you!