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by LenShustek
Mon Dec 16, 2019 5:34 am
Forum: ESP32 Arduino
Topic: USB to Serial ESP bootloader issues
Replies: 7
Views: 24724

Re: USB to Serial ESP bootloader issues

Like many people, I often get the dreaded "Failed to write compressed data to flash" when using esptool. In my case it is running on a Windows PC, talking to a Teensy 3.5 which is relaying the serial data to and from the ESP32. It seems like a timing problem, because if I turn on the trace mode of t...