Download latest Wotan Client.
Take out the battery
Delete the login information in wotan client
press start
press 2+5 on your phone and keep holding it
plugin your phone
put the battery back in (while you still hold down the keys)
now your erom should get updated

If you get Error Semsec status 3 you have to flash the EROM manually. Please post again if that happens and someone will tell you how to do it.
Good luck