I updated an older Raspbian Jessie image (imaged around April/May of 2016) using
sudo apt-get update && sudo apt-get dist-upgrade -y, followed by an
sudo rpi-update straight after. This is on an RPi 2 B. A reboot resulted in a quickly flashing boot screen with 4 Raspberries, followed by a reboot, ad infinitum.
Is there any way I can get this image back to working order, without starting over? I've looked in `/boot' but cannot see older kernel images or anything I can switch to. Any other tips on where I should look to find the fault in the boot sequence (e.g. a log file or something) would be much appreciated as well.