The safest and best solution is just to mod over the top of it as if it had never been modded before. (UN-modding is not completely possible, dangerous and has no real benefits)
I would suggest ModMii for Windows. Run it and tell it you've never modded before and it will download everything you need and generate a guide for you to follow.
I think I re-used ModMii a couple weeks back, so I'd assume that fixed stuff if anything was even wrong... Does this look right to you?
sysCheck v2.1.0b19 by Double_A and R2-D2199, Nano
...runs on IOS58 (rev 6176).
Region: PAL
System Menu 4.2E (v482)
Priiloader installed
Drive date: 2008.12.18
Homebrew Channel 1.1.0 running on IOS61
HomebrewFilter ist nicht installiert
Hollywood v0x11
Console ID: 69309625
Boot2 v4
Found 84 titles.
Found 52 IOS on this console. 3 of them are stub.
IOS4 (rev 65280): Stub
IOS9 (rev 1034): No Patches
IOS10 (rev 768): Stub
IOS11 (rev 16174): Trucha Bug, NAND Access
IOS12 (rev 526): No Patches
IOS13 (rev 1032): No Patches
IOS14 (rev 1032): No Patches
IOS15 (rev 1032): No Patches
IOS16 (rev 54321): Trucha Bug, ES Identify, Flash Access, NAND Access
IOS17 (rev 1032): No Patches
IOS20 (rev 16174): Trucha Bug, NAND Access
IOS21 (rev 1039): No Patches
IOS22 (rev 1294): No Patches
IOS28 (rev 1807): No Patches
IOS30 (rev 16174): Trucha Bug, NAND Access
IOS31 (rev 3608): No Patches
IOS33 (rev 3608): No Patches
IOS34 (rev 3608): No Patches
IOS35 (rev 3608): No Patches
IOS36 (rev 3608): Trucha Bug, ES Identify, NAND Access
IOS37 (rev 5663): No Patches
IOS38 (rev 4124): No Patches
IOS40 (rev 16174): Trucha Bug, NAND Access
IOS41 (rev 3607): No Patches
IOS43 (rev 3607): No Patches
IOS45 (rev 3607): No Patches
IOS46 (rev 3607): No Patches
IOS48 (rev 4124): No Patches
IOS50 (rev 16174): Trucha Bug, NAND Access
IOS51 (rev 4864): Stub
IOS52 (rev 16174): Trucha Bug, NAND Access
IOS53 (rev 5663): No Patches
IOS55 (rev 5663): No Patches
IOS56 (rev 5662): No Patches
IOS57 (rev 5919): No Patches
IOS58 (rev 6176): USB 2.0
IOS60 (rev 16174): Trucha Bug, NAND Access
IOS61 (rev 5662): No Patches
IOS62 (rev 6430): No Patches
IOS70 (rev 16174): Trucha Bug, NAND Access
IOS80 (rev 16174): Trucha Bug, NAND Access
IOS90 (rev 54321): Trucha Bug
IOS202[60] (rev 65535, Info: hermesrodries-v6): Trucha Bug, NAND Access, USB 2.0
IOS222[38] (rev 65535, Info: Hermes-v55.1): Trucha Bug, ES Identify, NAND Access, USB 2.0
IOS223[37] (rev 65535, Info: Hermes-v55.1): Trucha Bug, NAND Access, USB 2.0
IOS224[57] (rev 65535, Info: hermesrodries-v6): Trucha Bug, NAND Access, USB 2.0
IOS236[36] (rev 65535, Info: rev 3351): Trucha Bug, ES Identify, NAND Access
IOS247[57] (rev 21006, Info: d2x-v6): Trucha Bug, NAND Access, USB 2.0
IOS248[56] (rev 21006, Info: d2x-v6): Trucha Bug, NAND Access, USB 2.0
IOS249[56] (rev 21010, Info: d2x-v10beta52): Trucha Bug, NAND Access, USB 2.0
IOS250[57] (rev 65535, Info: d2x-v10beta52): Trucha Bug, NAND Access, USB 2.0
IOS254 (rev 65281): BootMii
BC v6
MIOS v10 (DIOS MIOS 2.6.1+)
Report generated on 2013/10/05.
...runs on IOS58 (rev 6176).
Region: PAL
System Menu 4.2E (v482)
Priiloader installed
Drive date: 2008.12.18
Homebrew Channel 1.1.0 running on IOS61
HomebrewFilter ist nicht installiert
Hollywood v0x11
Console ID: 69309625
Boot2 v4
Found 84 titles.
Found 52 IOS on this console. 3 of them are stub.
IOS4 (rev 65280): Stub
IOS9 (rev 1034): No Patches
IOS10 (rev 768): Stub
IOS11 (rev 16174): Trucha Bug, NAND Access
IOS12 (rev 526): No Patches
IOS13 (rev 1032): No Patches
IOS14 (rev 1032): No Patches
IOS15 (rev 1032): No Patches
IOS16 (rev 54321): Trucha Bug, ES Identify, Flash Access, NAND Access
IOS17 (rev 1032): No Patches
IOS20 (rev 16174): Trucha Bug, NAND Access
IOS21 (rev 1039): No Patches
IOS22 (rev 1294): No Patches
IOS28 (rev 1807): No Patches
IOS30 (rev 16174): Trucha Bug, NAND Access
IOS31 (rev 3608): No Patches
IOS33 (rev 3608): No Patches
IOS34 (rev 3608): No Patches
IOS35 (rev 3608): No Patches
IOS36 (rev 3608): Trucha Bug, ES Identify, NAND Access
IOS37 (rev 5663): No Patches
IOS38 (rev 4124): No Patches
IOS40 (rev 16174): Trucha Bug, NAND Access
IOS41 (rev 3607): No Patches
IOS43 (rev 3607): No Patches
IOS45 (rev 3607): No Patches
IOS46 (rev 3607): No Patches
IOS48 (rev 4124): No Patches
IOS50 (rev 16174): Trucha Bug, NAND Access
IOS51 (rev 4864): Stub
IOS52 (rev 16174): Trucha Bug, NAND Access
IOS53 (rev 5663): No Patches
IOS55 (rev 5663): No Patches
IOS56 (rev 5662): No Patches
IOS57 (rev 5919): No Patches
IOS58 (rev 6176): USB 2.0
IOS60 (rev 16174): Trucha Bug, NAND Access
IOS61 (rev 5662): No Patches
IOS62 (rev 6430): No Patches
IOS70 (rev 16174): Trucha Bug, NAND Access
IOS80 (rev 16174): Trucha Bug, NAND Access
IOS90 (rev 54321): Trucha Bug
IOS202[60] (rev 65535, Info: hermesrodries-v6): Trucha Bug, NAND Access, USB 2.0
IOS222[38] (rev 65535, Info: Hermes-v55.1): Trucha Bug, ES Identify, NAND Access, USB 2.0
IOS223[37] (rev 65535, Info: Hermes-v55.1): Trucha Bug, NAND Access, USB 2.0
IOS224[57] (rev 65535, Info: hermesrodries-v6): Trucha Bug, NAND Access, USB 2.0
IOS236[36] (rev 65535, Info: rev 3351): Trucha Bug, ES Identify, NAND Access
IOS247[57] (rev 21006, Info: d2x-v6): Trucha Bug, NAND Access, USB 2.0
IOS248[56] (rev 21006, Info: d2x-v6): Trucha Bug, NAND Access, USB 2.0
IOS249[56] (rev 21010, Info: d2x-v10beta52): Trucha Bug, NAND Access, USB 2.0
IOS250[57] (rev 65535, Info: d2x-v10beta52): Trucha Bug, NAND Access, USB 2.0
IOS254 (rev 65281): BootMii
BC v6
MIOS v10 (DIOS MIOS 2.6.1+)
Report generated on 2013/10/05.