A bit of quick checking showed that the rcS file in 3.11.0 is the same as the rcS file in 3.8.0 so if you already had an advboot/koreader setup, all you need is to re-add the modified rcS file. The KoboRoot.tgz inside the advboot_rcs.zip file attached to this message will take care of that change (copy the KoboRoot.tgz file to the .kobo directory, safely disconnect and wait for it to install). This has been tested on a Kobo Glo, Aura HD and Aura H2O with firmware 3.11.0 installed.
If you need to do the full advboot/script files install, the file attached to message #47 in this thread
advboot message #47 will take care of that for you.
edit: Corrected copy/paste error in rcS files. Thanks to traycold for the sharp eyes!