Thanks for the new instructions!
However there is no 01 before the first group of 16 FFs, do you have any idea what else I should look for?
https://i.imgur.com/ZfPya5v.png


Do you have more context before your 32 F? In my experience two groups of F are separated, having an 8 bytes thing ...

2.0 and Space Age update: Pawelzwroneks' tool still useful, and the bit is still near and before chat history. Other than that, nothing apply to new saves. To re-enable achievements, type some random thing into the chat, then save the game. unpack every level.datX like previous instructions(or write ...