You seem to really know it all don't you so ok read this then talk.... As the fw and/or emmc is NOT written to a worm or rom device in any way then it IS completely reversible as you would know if you did some homework on the schematics of the N900. Anything we write to the N900 IS completely reversible and i don't even have to be a Nokia design engineer to know that after looking at the schematics, they were at least clever enough to go that far on the design to let it be open for development purposes so you really do need to get YOUR facts right before trying to argue with someone with over 2 decades of programming and troubleshooting experience as i base my facts on general everyday experience of past work and sometimes don't even have to think to know an answer. Fact also that the only thing software driven that will kill N900 is a overclock situation but apart from that i don't see anything else "kill-able" by software in the device (hence the closed drivers to keep developers from doing harm). Try to at least spell and please do refrain from making uneducated nasty comments.