Thank you so much Dack, you're great mate
I finally can play Wii Fit PAL on my NTSC-US Wii, I tried the newest version of your software, WiiScrubber 1.2, it works like a charm
. The modified *.dol files (by Generic Wii Patcher) now can be saved to the partition 2 & 3 of the iso, no more 001 error
The only small problem is that I have to use Freeloader, but it's fine as I can avoid to update my Wii
So my experience on a Wii NTSC-US with chip which can't be updated is
1. Get the Wii Fit PAL scrubbed iso
2. Extract the 2 main.dol files by WiiScrubber
3. Apply the 001 remove by Generic Wii Patcher on these 2 *.dol files. Save them carefully
4. Save these 2 *.dol files by WiiScrubber
5. Burn the new iso
(2nd & 4th step thanks to guide of Dack on the previous page. The save at 4th step took me more than 1 minutes for each main.dol)
Hope this can be useful for someone
Thank you again Dack