If you only add 99 of items in your Inventory and 99 in your item box your game is infinitely less likely to freeze and you won't have the chance of getting "soft-banned".
Don't add more of certain files like Estus Flasks than the game would regularly allow.
Don't add a ton of things at once. If you just change the numbers of the item to 99 and a couple items it's safer than adding everything at once.
Don't delete too many things at once.
Don't add special items like soapstones, ashen mist heart, kings ring, etc.
Load your save offline after every modification, travel somewhere and save/quit before you connect online fixes some issues as well.
IF YOU FOLLOW THOSE GUIDELINES.... You're save is a lot more likely to work and you are infinitely less likely to get banned.
Jappi, one suggestion for future updates..... Allow the loading of just USER_DATA files. I've found when you edit them and reinsert into the save you face a lot fewer issues. I was doing that with the latest FROM patch, I'd modify and old save then extract the USER_DATA and inject into my current save. It gets around STFS issues and is more likely to work online after patches. Also add an option to not add more than 99 of items (except arrows of course) as this will almost completely people from getting banned.
Thanks as always for the awesome work.
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