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A quick browse through the linked screen controller datasheets indicates the controller *CAN* be persuaded to permit write access to a blank SPI FLASH chip on the display cable. Digging into the code for the Update EINK waveform option of the diags mode would probably provide enough info to write a standalone utility to read and write the SPI FLASH waveform data without checking the screen's model code. As a safety feature, I would suggest requiring the exact model code to be entered for write if it is non-blank.
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