Thank you for your feedback.
We are able to recreate your issue and found a solution.
The English guide you sent us was correct but the extra step was necessary.
6. An extra step. Perform it if you encounter errors after you changed the path to your profile. Search the registry for ‘old account name’. If you find the values with the old path change it the the new one. Hit “F3” in the registry editor until you correct all entries containing the old path.
However you don't need to find and change all the values.
All you need to find is the path "HKEY_USERS\S-1-5-xx-xxxxxxxxxx-xxxxxxxxxx-xxxxxxxxx-xxxx\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders" and change the value from "phili\AppData\Roaming" to "Philip\AppData\Roaming".
As you might know, "S-1-5-xx-xxxxxxxxxx-xxxxxxxxxx-xxxxxxxxx-xxxx" is the value related to the old account that shows at the 5th step on the English guide.
We hope it helps.