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TinySoftwareSerial RX is broken in 2.0.0

Status: Open.

#925 In SpenceKonde/ATTinyCore;

· MCUdude opened on Mar 15, 2026

ATTinyCore install fails – azduino.com micronucleus download refused

Status: Open.

#924 In SpenceKonde/ATTinyCore;

· GabrielY1212 opened on Mar 13, 2026

ATtiny84a upload errors

Status: Open.

#923 In SpenceKonde/ATTinyCore;

· Jimbolaya64 opened on Feb 16, 2026

Sleep not shutting down fully

Status: Open.

#921 In SpenceKonde/ATTinyCore;

· JulesGren opened on Jan 27, 2026

ATTinyCore Board Download Error - 3.218.2.136:443: connect: connection refused

Status: Open.

#919 In SpenceKonde/ATTinyCore;

· dd6ds opened on Jan 10, 2026

Boot Entry mode menu

Status: Open.

#918 In SpenceKonde/ATTinyCore;

· gromdar opened on Jan 1, 2026

(Manual) Installation of ATTinyCore v2.0.0 on Arduino IDE v2.3.6

Status: Open.

#915 In SpenceKonde/ATTinyCore;

· GiorgosXou opened on Dec 21, 2025

Problem Installing ATTinyCore on Arduino IDE 2.3.6

Status: Open.

#913 In SpenceKonde/ATTinyCore;

· Mauro5049 opened on Oct 9, 2025

failed to verify certificate on https://azduino.com/bin/micronucleus/micronucleus-cli-2.5-azd1-x86_64-linux-gnu.tar.bz2

Status: Open.

#912 In SpenceKonde/ATTinyCore;

· ArminJo opened on Oct 8, 2025

Please document prevenance of bundled hex bootloaders

Status: Open.

#906 In SpenceKonde/ATTinyCore;

· Github-Home-User opened on May 26, 2025

[Bug] Upload with micronucleus fails with space in build path

Status: Open.

#904 In SpenceKonde/ATTinyCore;

· smlz opened on Apr 1, 2025

Blink sketch Attiny84a delay issue

Status: Open.

#903 In SpenceKonde/ATTinyCore;

· ITstreet1 opened on Mar 28, 2025