Occasionally after battery removal, canaries enter an unresponsive state in which no user action (battery insertion, RST short- or long-press, ribbon cable connection, etc.) can activate the board. This has been most frequently observed following keyboard interrupt of the mosquitto message broker immediately prior to battery removal. The only way a canary has been observed to regain function is after it has been left unpowered for 12 hours; boards from an old batch require 60 hours. We suspect a capacitor is supplying sufficient charge to hold something in working memory that prevents the board from engaging its normal startup routine.
Occasionally after battery removal, canaries enter an unresponsive state in which no user action (battery insertion, RST short- or long-press, ribbon cable connection, etc.) can activate the board. This has been most frequently observed following keyboard interrupt of the mosquitto message broker immediately prior to battery removal. The only way a canary has been observed to regain function is after it has been left unpowered for 12 hours; boards from an old batch require 60 hours. We suspect a capacitor is supplying sufficient charge to hold something in working memory that prevents the board from engaging its normal startup routine.