I have been using RPi 3b for several months with a set of power supply and cable. I recently upgraded raspbian to Bullseye. That was also fine. I added a camera today and then on RPi is not booting. I connected a monitor with HDMI and it shows undervoltage error with a yellow flash. Except OS and Camera, nothing has changed.
Even after disconnecting camera, issue now persists. The device is not booting which means I cannot do anything over wifi and ssh.