You're using the old Syscheck. Use the new one
Ok, here is the report from the newest version of SysCheck I could find:
SysCheck HDE v2.4.0 HacksDen Edition by JoostinOnline Double_A R2-D2199
...runs on vIOS58 (rev 6432).
Region: NTSC-U
System Menu 4.3U (v609)
Drive date: 07.12.2012
Homebrew Channel 1.1.2 running on IOS58
Hollywood v0x21
Console ID: 618961796
Console Type: vWii
Shop Channel Country: United States (49)
Boot2 v0
Found 86 titles.
Found 35 IOS on this console. 0 of them are stubs.
vIOS9 (rev 1290): No Patches
vIOS12 (rev 782): No Patches
vIOS13 (rev 1288): No Patches
vIOS14 (rev 1288): No Patches
vIOS15 (rev 1032): No Patches
vIOS17 (rev 1288): No Patches
vIOS21 (rev 1295): No Patches
vIOS22 (rev 1550): No Patches
vIOS28 (rev 2063): No Patches
vIOS31 (rev 3864): No Patches
vIOS33 (rev 3864): No Patches
vIOS34 (rev 3864): No Patches
vIOS35 (rev 3864): No Patches
vIOS36 (rev 3864): No Patches
vIOS37 (rev 5919): No Patches
vIOS38 (rev 4380): No Patches
vIOS41 (rev 3863): No Patches
vIOS43 (rev 3863): No Patches
vIOS45 (rev 3863): No Patches
vIOS46 (rev 3863): No Patches
vIOS48 (rev 4380): No Patches
vIOS53 (rev 5919): No Patches
vIOS55 (rev 5919): No Patches
vIOS56 (rev 5918): No Patches
vIOS57 (rev 6175): No Patches
vIOS58 (rev 6432): USB 2.0
vIOS59 (rev 9249): No Patches
vIOS62 (rev 6942): No Patches
vIOS80 (rev 7200): No Patches
vIOS236 (rev 65535): Trucha Bug ES Identify NAND Access
vIOS249[56] (rev 21010 Info: d2x-v10beta53-alt-vWii): Trucha Bug NAND Access
vIOS250[57] (rev 21010 Info: d2x-v10beta53-alt-vWii): Trucha Bug NAND Access
vIOS251[58] (rev 21010 Info: d2x-v10beta53-alt-vWii): Trucha Bug NAND Access
vIOS512 (rev 7): No Patches
vIOS513 (rev 1): No Patches
Report generated on 12/18/2015.
Not sure if any of those are an issue any why the WIIU update kept failing. For now I was able to spoof to 5.5 and my kids are happy being able to play online. It would be good to determine if any of those IOSs are incorrect and why the WIIU update was failing.