"downgrade" to 1.1.0.18040 should be done automatic, thats why the partitions of your current fw are saved, next step should be the flashing of the 1.1... rootfs.
Are you sure that the IM of your reader is empty (beside the installer files)?
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when installing PRS+ on non US version of the reader, make sure that you have at least 50mb of free space on internal memory. This space is needed for the backup of the original firmware. (you can delete/save backup files somewhere else after the installation)
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If I remember correctly (I'm at work, no device nearby) that there is a Expert-Mode in the Installer-Main-Menu.
You can try this and force installation of rootfs and fsk-partition.
You can also use the PRS+ Uninstaller from the project page to setup 1.1. 0.18040. This is a standard-sony-fw-updater modified in only one way, so that it will work with all possible fw-versions.