If you feel unsure at any step, take your device to an authorized Nokia service center. A professional flash costs less than a new motherboard.
Many Nokia TA-1468 units use a MediaTek chipset. If OST LA fails, you can use with a scatter file . nokia ta-1468 firmware download
Analysis of Firmware Acquisition and Flashing Procedures for the Nokia TA-1468 Subject: Mobile Device Firmware / Embedded Systems Date: October 2023 If you feel unsure at any step, take