Hall Research USB-EDID-PRO2 - Manual (Page 9)

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MODEL EMX-DVI EXTENDER & EDID MGR
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2.8. EDID Data Display
The data shown in the EDID table is periodically
scanned to ensure that the checksums for each
block are valid.
When wrong checksums are detected, the
invalid checksum byte is highlighted in RED.
If an action is performed that affects the EDID such as initiating a "learn"
process, The checksum field might momentarily flash ‘RED’ during the this
process, but should go back to normal once the entire table is updated.
NOTE
You cannot “LEARN” an EDID that has an invalid
checksum. If you try to learn an EDID that has a
checksum error, the PASS‐THRU and EMULATE LEDs
on the unit will alternately flash 5 times to indicate
the error.
However, the GUI software can import and upload to
the EMX‐DVI, EDID’s that contain invalid checksum