No prob, you are welcome) Frankly speaking, I do not get what you mean by 'region file'. You can flash variant 468, but notice, that you will be unable to roll back to 454 after it. However, speaking about 'content files', you can flash any of them in any time (content files usually have EMMC in their names). If I were you, I would definitely check out the first message of those thread If you have any further questions, please, PM me.