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I've got printer where some Nuvoton chip (NUC120LC1...) is soldered on display/TFT board, bot DSP M7-M01.
Photo: http://lev.serebryakov.spb.ru/_sklad/anycubic3di3mega-screen-board-20170406.jpg

Also, I was able to build firmware from PUBLIC folder with old Arduino IDE (newer versions have newer compiler, which reports errors), but I didn't try to upload it yet, I don't want to brick my first and only printer.