One can use all number of various instruction available...
Most are not new-user-proof, in easy to understand format and instruction.
Many are incomplete instructions.
Even the official instruction in the wiki is not kind to newcomers who know little.

I suggest following my guide.
It includes many references to others work here, and fills in the gaps for those who are new to all this, or have forgotten the process due to the length of time between needed reflashes.

Yes ..there is little clarity in most old instructions. That is why I made the guide in my sig.
No...I cannot agree...the device is not outdated...
If one was never given a faster than light crap phone...first.
and given a n8x0 ...instead....THEN ...after a couple years enjoyment ...
given a modern piece of android or iphone crap...
You ...like many ...would either sit on said pile of offending crap and complain about the crap...
or...
find alternatives...
and/or...
go back to what was a good enjoyable n8x0 ...even ...n900 ...experience ...
the n8x0's did change my mind on the understanding of what obsolescence is...
Slower than modern device doesn't necessarily mean obsolete...
Not having for software ...what everyone else has ...isn't necessarily an obsolescence issue either.

possibly...you may just need to install the bootmenu...
I suggest starting over from scratch...with my guide.