I was following this Guide:

https://pokemon-speedrunning.github.io/speedrun-routes/#/gen-1/red-blue/main-any/

I got the timing for the save corrupt right and followed the instructions of swapping the pokemon, the items and the pokemon again. But after I close the Menu, the Screen freezes and a random Check pattern is shown (see screenshot below).

For the setup, I followed this Guide (and it seems to work):

https://www.speedrun.com/pkmnredblue/guides/wf0la

What I did not do is the Manip TID 64C2 (25794) because I did overread it first:

Do I have to perform the Manip TID 64C2 (25794) before the save corrupt? And if so, do I need to do it before every run? Or is the problem something else?

I am very thankfull for any help and I am looking forward to hear from u :)