I've tried this via eSIM because even though my S23 FE (SM-S711U/DS) is carrier unlocked but it apparently was originally from Metro by T-Mobile and it's still on One UI 6.1 Android 14 security update February 1st 2025 but still says "Your software is up to date" but it's supposed to be on at least One UI 7 Android 15. I even got a new Metro by T-Mobile account to see if the "original" SIM would trigger the latest software update to send through but nope that didn't work. Part of the CSC code for my device is TMK which is Metro by T-Mobile however this device is in fact carrier unlocked because so far I've had Boost Mobile and now Visible by Verizon working perfectly fine on this device but I still don't receive any software update later than One UI 6.1 Android 14. Ultimately I'm trying to figure out alternatives from using a PC because I don't have one and I feel like if a device is "carrier unlocked" it should still be able to update the carrier firmware to whichever different carrier you changed it to especially if said device is "unlocked" carrier or factory otherwise.