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Pi 4 B Bootloader Diagnostics Screen

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The P4B boot eeprom bootloader can display a diagnostic screen via HDMI when no micro-SD card is present and other boot mechanisms fail. Early versions of this can be seen here. Below are examples from June 2020 or September 2020 when no micro-SD card was present but either a non-booting Kingston USB3 flashdrive or a USB3-to-SATA connected SSD was plugged in.

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2022-06-29 23:01