/sbin/init not found when upgrading from 3.12.3 to 3.13.0 using CD + lbu
I'm trying to upgrade a diskless installation (config and apk cache on usb) from Alpine 3.12.3 to 3.13.0 but while booting the new ISO image I get the following error when the USB stick is inserted:
ISOLINUX 6.04 4.04-pre1 Copyright (C) 1994-2015 H. Peter Anvin et al boot: /sbin/init not found in new root. Launching emergency recovery shell Type exit to Continue boot. sh: can't access tty; job control turned off / #
When I boot the new ISO an empty USB stick all works fine and I can configure Alpine from scratch. However I'd like to upgrade and migrate my previous settings and packages as I used to do whenever I switched release.