I checked your schematic, and here’s what I found regarding MEC1503 EEPROM/EC reset:
  • The MEC1503 in your board boots from an external SPI flash (Winbond W25R256JVEIQ, 32 MB) . This is where the EC firmware/EEPROM contents are stored.
  • There is a functional strap (GPIO045/KSO01 → CR_STRAP) that selects Normal Boot (HIGH) or Crash Recovery mode (LOW) .
    • In Crash Recovery mode, the EC can reflash firmware via the keyscan connector or external programmer.
  • There are also EC reset pins:
    • -EC_RESET line
    • GPIO061/ESPI_RESET#
      These reset the MEC1503 logic but do not erase EEPROM; they just
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