"I updated to a newer version of the hack, do I need to replay it all?"

This is something that might be a common question. The answer is simply no. 

If you updated, your ROM should still be named "TLOZOOS.gbc" and your save should be "TLOZOOS.sav"
If you changed the name of the previous ROM/SAVE, just change the new ROM to the same name, and it should work
properly. No need to replay it all!

If there is still any issue, you can DM me on Discord for help. 
My tag is DorrieDD#4415, I am also in the Oracles/LA hacking discord, Wind Fishes' Breeze.