The best source is always the official stock ROM.
The MT6833 supports eMMC 5.1 and UFS 2.2 storage. Flashing tools (SP Flash Tool, mtkclient, fastboot) rely entirely on the scatter file. A low-quality scatter file can cause: mt6833 scatter file extra quality
Extra Quality means the scatter file is not just syntactically valid but semantically correct for a specific MT6833 variant and its storage type. The best source is always the official stock ROM
Why do people specifically search for "extra quality" when it comes to this scatter file? Because low-quality scatter files are rampant online. Here’s what separates a standard file from an extra quality one: Extra Quality means the scatter file is not
The preloader should be on EMMC_BOOT1 with a size of exactly 0x40000 (256KB) or 0x80000 (512KB). If it’s larger, it’s corrupted or from a different chip.