To be honest I couldn't say. But you can install this over your softmod, I will replace your current softmod. You can just use the quick upgrade.zip & follow the instructions in the zip. Also there are no NTSC Bios, the region is stored in the EEPROM. The issue is that not all games support 480p & it's not as simple as changing a couple bytes, some games will need excessive patching to work 100%. You could try forcing 480p via NKPatcher Settings & disabling it in the dashboard. (When forced, the dashboard setting is not used, but if it's still enabled games will use it. Disabling stops this & NKPathcer forces the video change, it fixes some games on v1.6 Xboxs that has scrambled screens)
Will try to install, but most likely will not make any difference. The games I am saying are not the ones known for issues, like Panzer Dragoon neither my Xbox is V1.6 (it's 1.1) Where can I force the 480p via NKPatcher? Is it a option on the softmod menu? Sorry for all the questions, I will definitely try your softmodding tool and give some feedback, just trying to figure some stuff that I never used.
To force 480p via my softmod you do the following. Applications > NKPatcher Settings > Video Modes > Force Progressive
ive been using this since i found your post with it linked from theisozone its Awsome and very stable by any chance could you put in a flashing menu to the xtras disc