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Information directly from WEMOS repository that is linked by their official website.
https://github.com/wemos/Arduino_D1/blob/master/boards.txt
Two changes are the Flash SPI uses dout (double out only) instead of dio (double I/O), and the reduction to 1M flash.
Tested on D1 mini, D1 mini Lite, and D1 mini Pro. All three work with the d1_mini_lite config. As usual, only the mini and mini Pro work with the old d1_mini config. Waiting to submit a dedicated Pro config until esptool and SDK properly supports 4MB+ flashing.