It should be possible, although I have no experience with that. I think you would be better off to configure U-Boot as I suggested above.

Well the Neo900 is very expensive when you compare the specs to a similarly priced phone but that's not its main selling point. I'm most attracted to the freedom and privacy features. Like a PC, there is no de facto OS, you are free to install or port whatever OS you like. There are no LTE modems with open firmware (modified open firmware would be illegal in most if not all countries). This raises serious privacy concerns such as NSA spying, etc. The Neo900 solution to this problem is to sandbox and monitor the modem. So what I mean in my signature is that with other phones, you don't really own them as you have little control over what they do and don't know if you are being spied on. I see the the Neo900 as a small price to pay for freedom and privacy.