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NVIDIA GTX 1650 or AMD Radeon RX 6400 (Ensure they do not require external PCIe power if you are using the stock Acer power supply).
This error means that the BIOS update file you are trying to use has a different identifier code (ROMID) than what your current motherboard's firmware is expecting. This often happens when you try to flash a BIOS intended for a slightly different model or a newer revision of the H81H3-AM board. acer h81h3am v10 manual upd
If you are using the manual to plan an upgrade, here are the hard limits for the H81H3-AM V1.0 NVIDIA GTX 1650 or AMD Radeon RX 6400