OK, so check out the E-ink Demo I have on here,
may or may not add anything useful
I think you need to toggle a pin before the reset or something, let’s see the code, You are using the SPI interface pins, some of the pins derive their power from different power group sections of the chip. perhaps that is only resolved if you toggle the Pins first before you use a “begin spi” type situation. If any of that makes sense to you. I had to do something similar if I recall to finally get it to work, or added a delay in the setup to give the slow interface a chance I think
PJ 