Can I Upgrade (or downgrade) my phone without unlocking the bootloader with an official firmware?

Recently, my Samsung A34 5G has installed the February 2025 security update.

Since it has been installed I've noticed issues with overall connectivity of my phone (Bluetooth, Cellular network, and especially WiFi).

My question is if I can revert the update without voiding my warranty, Im not interested in moding, I would just install the oficial firmware that my phone had pre-update (The November 2024 update).