Wii 3.4E Bannerbomb boot from sd not working

Hi,

I have a Wii 3.4E and few years ago it was softmod using the Bannerbomb exploit and using HackMii installer.
It worked fine I don't know what happened when my sister borrowed it. There is no homebrew channel anymore.
I formatted the Wii. I am following the Bannerbomb exploit so I can install the homebrew channel.
I have tried all the files from the bannerbomb alpha V1 page, link below.
When I go to the SD card on the Wii the pop up dialog does not show. It looks like the boot.dol file is not being recognised or not booting.
(https://bannerbomb.qoid.us/index.old.php)

Any ideas what I can do to get the homebrew channel installed?

Thanks, Riaz