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The Raspberry Pi firmware reads config.txt from partition 1 BEFORE processing autoboot.txt. Without arm_64bit=1 on the boot control partition, the firmware defaults to 32-bit mode and shows only a rainbow square. Add minimal config.txt, device tree blobs, and overlays to partition 1 so the firmware can initialize correctly before redirecting to the A/B boot partitions. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>