I've personally tried, with this new update released March 20th:
First visit shop channel after you've update Check
Try play online with some backup Nintendo WFC games after update (Brawl, etc.) Check
Try Trucha signed game Check
Try Wii Freeloader (backup or not) Check (joedodgy)
Try Twilight hack, try deleting and then copying hack save file over and booting from internal SD Check
I'll label this as a SAFE. Someone on GoNintendo said Freeloader works (but theirs is probably not a backup). I'm too lazy to burn a region incompatible game AND Freeloader tonight so I'll take their word.
This update gets the COOLBHO3000 OFFICIAL SEAL OF KIKKOMAN
UPDATE: THE UPDATE RELEASED RECENTLY, NOT THIS ONE ON THE 20TH, DOES NOT GET THE SEAL!!!! IT IS IOS37 DANGER DANGER DO NOT UPDATE WII
http://gonintendo.com/?p=38387
First visit shop channel after you've update Check
Try play online with some backup Nintendo WFC games after update (Brawl, etc.) Check
Try Trucha signed game Check
Try Wii Freeloader (backup or not) Check (joedodgy)
Try Twilight hack, try deleting and then copying hack save file over and booting from internal SD Check
I'll label this as a SAFE. Someone on GoNintendo said Freeloader works (but theirs is probably not a backup). I'm too lazy to burn a region incompatible game AND Freeloader tonight so I'll take their word.
This update gets the COOLBHO3000 OFFICIAL SEAL OF KIKKOMAN
UPDATE: THE UPDATE RELEASED RECENTLY, NOT THIS ONE ON THE 20TH, DOES NOT GET THE SEAL!!!! IT IS IOS37 DANGER DANGER DO NOT UPDATE WII
http://gonintendo.com/?p=38387