Check armstub8.bin compatibility - The armstub8.bin file is primarily used to boot in AArch64 (64-bit) mode. Make sure you are using the correct version of armstub8.bin that is compatible with your Raspberry Pi 3 B. If using the official Raspberry Pi OS, try replacing armstub8.bin with the version from the latest firmware repository:
Download from: https://github.com/raspberrypi/firmware
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