If there's one thing that I dislike about the custom firmware scene, it's that those that have worked out how to do it are waaay too terse in their instructions when instructing others on how to do the same. Happily, the 'cook' of one of my favourite custom firmwares, Delight, has taken the time to put together a decent tutorial on firmware flashing, with notes and screenshots. It's still not a smooth read, but it's a heck of a lot better than not having any detailed instructions at all. Bookmark this if you're intending to flash any modern Symbian phone and save yourself a lot of hassle.

From the tutorial article:

We've been getting a lot of inquiries on how to flash a Nokia phone
so I decided to make a new flashing tutorial.
and not as a txt or a FAQ, but rather as a blog post.

• First of all you need the flashing tool:

I recommend Phoenix 2012.04.xxx for Generation^1 phones (N8, C7, E7, X7, C6-01, E6)
and                Phoenix 2012.16.xxx for Generation^2 phones = Fp1 & Fp2 = 808, 700, 701, 603 & 500

if you ever installed a higher version of Phoenix, then you must deinstall it first.
Get it and install it to Windows with your Anti-Virus OFF.
You have to trust me on this one. If you can't trust me, then stop here, because if you don't turn your anti-virus off, then you can NOT flash
If you don't believe me, then Google it, and every flashing or installation guide worldwide will tell you the same.

• Second you need to download your files.

preferbly Delight custom firmwares, but any full set of files, for original or custom firmware will do as well

Delight cfw's files come in self-extracting .zip files, so just double click them to extract.
Extract them somewhere, where you can find them easily, for instance Desktop

"Why don't I just extract it directly to the RM folder?" because if you don't have full access configured in your computer, then extracting stuff to C: will get denied. 

You can read the rest of the piece here (along with its original hyperlinks).

Regular readers will remember that I've been experimenting with custom firmwares on some of my own Symbian devices, notably the Nokia E6 (Belle Refresh Enhanced) and C7 (Delight 6.2), though I'm sure I'll be doing more of this now that Nokia's own update schedule seems to be winding down (and now that most Symbian devices are probably out of warranty by now). At some point I'm going to head into Delight for the Nokia 808 - gulp! I'm sure it'll be epic though - comments welcome if you're already using this. Any downsides?