You're looking for content related to the firmware of the Tecno Spark 20 Pro Exclusive. Here's what I could gather:
Moreover, Tecno has used the exclusive firmware to implement features at the kernel level. Features like "Always-On Display" for the LCD panel (simulated via selective backlight zones) and "Dual Bluetooth FastPair" are not app-level tricks; they are hardware-level functions enabled by the firmware stack. This ensures that when Tecno releases a security patch, it addresses vulnerabilities specific to the Spark 20 Pro’s hardware configuration, not a generic AOSP patch. firmware tecno spark 20 pro exclusive
If your downloaded package lacks the .auth file or the correct scatter.txt , it is and will likely fail to flash. You're looking for content related to the firmware