My solution,

Put down boot butom, always put down and put on reboot butom. I'm in boot mod and I can retrive my COM port and I send a new firmware and is ok.

Thank's for your answers !!!!

Max

Hello,

Can you help me to reset factory my T-display lilygo ?

When I send program to it, it loose COM port. I must to use BOOT mode to retrive COM port eatch time to send another one.
It's impossible to write on screen.

I try micropython and I'm back to arduino and now have plenty problem.

Thank ...