Some people are getting an error when trying to update a flashed console with the new dashboard, which also flashes the drive back to stock. It recognises that the 360 has been modified and throws up an error. You can try it if you want to, cos I believe you can recover from it if you get that error, but it's at your own risk!
You can download the original firmware off the web, so all you need to do is dump your key, inject that into the OG firmware, then flash the console with it - basically, the exact same thing you would do when flashing it with LT+, just that you're using the original firmware instead.
Doing that may well flag the console for a ban at the same time though. Do some more research before you jump in, cos I only know about the error because I read about it on Xbox-Scene where numerous people got it and some recovered from it, but I don't know what consequence the error has in terms of the console being banned.
I would recommend flashing it back to stock first, updating the dashboard, then giving it to your friend. If you do anything but that, it's all at your own risk.
