Unlike "Download Only," the "Firmware Upgrade" option preserves user data while updating the system partitions. This is useful for minor OTA (Over The Air) updates that you want to install manually.
In the world of Android customization, repairing a bricked device or flashing a custom ROM is a rite of passage. For devices running on MediaTek (MTK) chipsets, the undisputed king of flashing software is the SP Flash Tool. sp flash tool v5.2152