MediaTek has tightened security. Newer stock ROMs (Android 11/12/13) for MT6768 enforce . The vbmeta partition in the new scatter file includes flags like disable_chained_verification . If you flash using an old scatter file that ignores vbmeta , the device will enter a bootloop or show a red state warning.
Always ensure the preloader_mt6768.bin is correctly linked in the SP Flash Tool alongside the scatter file. mt6768 scatter file new
Do not trust random Google Drive links. Here are the reliable sources: MediaTek has tightened security