@rickcook OK, I don't have enough to go on!
So...raise an Issue here:
https://github.com/Xinyuan-LilyGO/LilyGO-T-A76XX/issues

And pester them at sales@LilyGO.cc

The hot device has 5 pins, check your schema for it.

The big resistor is harder to find on the schema. Have you measured the resistance?

Also other LilyGO products don't like multiple power sources due to feed back.

Can you be certain that the Solar is regulated to 5V.

Cheers, Terry

@vitaj You might try raising an 'Issue' here:
https://github.com/Xinyuan-LilyGO/LilyGo-EPD47/issues
And then attract their attention with an email here:
sales@lilygo.cc
E-Paper displays show their last image until refreshed.
Did you try a simple example from here?:
https://github.com/Xinyuan-LilyGO/LilyGo-EPD47/blob/master/examples/screen_repair/screen_repair.ino

@fender21 Did you find a solution. I have exactly the same issue. Brand new devices out of the box. They have firmware on them which boots and runs diagnostics. All Diags appear to run successfully. I cannot get it to go into DFU Mode. Tried many combinations. When booted in diags the USB port is not recognizing anything either.

@ohiojoe Nice Work!

@cony54 LilyGO believe that this community site is off line:
"As our forums are under maintenance, if you have a question about a product, please post the appropriate thread on our GitHub."
on their main web page:
https://www.lilygo.cc/products
It is just me (!) and a few other users manning this site.
You can try raining an #Issue on their GitHub and maybe lewis he will read it?

Same issue here. Using T-Beam v1.1

@teastain2 Thanks for the idea

Did you find a solution to this?

@kadri Can you provide code for how your setting up the two devices?

@witchdoc Perfect! Thanks for getting back to me.

@charlyd Good to hear!

@papadeltasierra BTW the ESP32c3's USB mode is disabled; unless you enable it, it should run as a standard serial port (which is what I am now seeing).