You need to remove preloader and go back to step 4 and do everything from 4&5 again. You will first reinstall ios 50, then reinstall system menu 3.4e.
1- download NUS
2- From NUS download IOS50-v4889, and pack as wad
3- From NUS download System Menu 3.4e v386 and pack as wad
4- put those two wad into your wad folder on your sd-drive
5- launch wadmanager form the HBC
6- Install IOS50-v4889
7- Install System Menu 3.4e v386
8- Go to 3-4.1 guide and start @ step 4, follow all directions.