Board

ESP32

Device Description

n/a

Hardware Configuration

n/a

Version

latest stable Release (if not listed below)

Type

Bug

IDE Name

Arduino IDE v1.8.19 (ie the last pre-v2 version)

Operating System

Windows 10

Flash frequency

n/a

PSRAM enabled

yes

Upload speed

n/a

Description

Note that the latest "github.com/espressif/arduino-esp32" (4Sept25) has a boards.txt file that has too many entries for the older Arduino IDE v1.8.19

Specifically, it breaks the COM-port access from the IDE (the "Tools/Port" selection menu-word is grayed out, and you can't upload any files or use the Serial-Monitor in the Arduino-IDE).

Interestingly this is even when non-ESP32 boards are selected.

The issue is not the raw file size, so I suspect its actually just the number of board entries.

The fix is simply to delete the last few board entries from the "arduino-esp32-master/boards.txt" file (or ones higher up if you are using the last few).
As at 4Sept25 I only needed to remove the last 3 boards.

Sketch

n/a

Debug Message

n/a

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.