So if I would connect my Teensy to the 5V it wouldn't break my board?

Hello,

so i have a "TTGO Lora32-Oled V1" board. It was working fine yesterday and now I get this output, when I try to upload anything
esptool.py v3.0-dev
Serial port /dev/ttyUSB0
Connecting........_____....._____....._____....._____....._____....._____....._____

A fatal error occurred: Failed to ...