If you followed the guide from A to Z that you say to install your cios d2x, I think they are badly installed, and you have a cios d2x (249) with a beta53-alt version (this version which does not work not good with port 0 of the wii) ==> You can see it if you run a new syscheck report.
try in the settings of usb loader gx, change your IOS 58 to 250 and see the result ??
, maybe you will manage to start correctly usb loader gx
If you wish, you can use Modmii ==>
https://gbatemp.net/threads/modmii-for-windows-official-support-topic.207126/
to correctly install your cios d2x by following this procedure ==> To correctly install the CIOS d2x with Modmii, follow the following instructions:
1) Open Modmii
2) type "I Agree"
3) select "4"
4) select "REC" (recommend cios)
5) select "D" (download selected files)
6) select "Y" (Yes)
7) your CIOS are loaded
8) select "O" and you will find your CIOS d2x in the "wad" folder on the opened page, recover them, and put them in the Wad folder on your SD.
9) you just have to install them with a Wad installer (wad manager, yet another wad manager mod, or other wad installers)