Trying to install some Linux boxes on Hyper-V RC1 to try MONO and some HPC approaches but hit the gfxboot boot hang problems. tried WinISO and UltraISO to edit the ISO files but seems those software had problems dealing with Linux ISO files. found this Ubuntu iso patch and saw that it’s using string searching to comment out the gfxboot settings in isolinux.cfg file, therefore had the idea to find a hex file editor to do the same thing on other linux iso files.
this one is free and got nice UI to use, Free Hex Editor Neo. the file operations are also fast that makes patching iso files a smooth work.