Since crash logs are not sent yesterday,
I'm not sure what kind of problem he is having.
If you crash with just executing FEBuilderGBA.exe, the configuration file etc. may be corrupted.
In that case, it will be resolved by re-downloading.
If re-downloading does not solve the problem, there is a problem with the environment such as OS.
If it crashes when ROM is opened, there is a possibility that the ROM is broken.
In that case, I would like to reproduce the problem and fix it based on the ups file.
If you crash on a specific screen, I have to check the code on that screen.
He only says crash, so I do not know exactly what is wrong. (-_-;
I watched a your movie.
I think that it is better to set the emulator with Option.
Even without saving each time, you can start the emulator just by pressing F5 key.
See this document.
Once corrected, start the emulator with the F5 key,
If it works as expected, writing it with Save.
If it does not work as expected, either modify it further or open the ROM again.
FEBuilderGBA is safe as it will not write to ROM unless you choose to save it.
Even if you make a mistake saving, you will be backed up so you can undo it immediately.
In the latest version, a mode to take backup with 7z has been implemented.
You can remodel it safely while reducing capacity.
As for the character string,
I think that it is easier if applying Anti-Huffman Patch in Method 2.