The simplest solution would be to configure your chip to autoboot on another wii. The update to 4.2u from disk, endless ocean 2 will probably have this update on it.
You should clarify what exactly you did. Using the wrong bannerbomb would only fail, and since you are on 4.1, there is no wrong bannerbomb, v1 and v2 work very well and would not likely brick your wii. So what exactly did you do, step by step that lead to this brick? Did you follow a guide? Also what system menu version is displayed in recovery menu via savemiifrii?