Actually I do not know sweenish (OK maybe those two specifically as they are out a bit later), I imagine most pressing plants are fairly busy right now (the few I know of certainly are) so we may have a mild reprieve for a few weeks.
Back on topic liteon drives can cough up their serial in fairly short order once they have been flashed once; no need for a probe second time around. Also you people need to find some better flashing shops if they did not provide your key.
"Where to find the iso to burn?"
In the iextreme 1.6 download; it compresses to hardly anything so it comes bundled.
Those new to these 360 circles the vast majority of xbox (original and 360) stuff is legally fuzzy at best so there is a semi private FTP network that hosts it all called xbins (the link I provided in the my last post up above was for the web frontend to it that just says what is new on the site).
To access it you need to join an IRC channel, request access via PM (it is automated enough) and then fire up an FTP client with the credentials you have just been provided.
Alternatively there is an automated method in the form of easyxbins:
http://www.360mods.net/index.php?name=Down...tails&id=29
You can find it in the "/XBOX 360/firmware/hacked firmware/LiteOn DG-16D2S/" directory. Grab LiteOn_iXtreme-THX_v1.6.REPACK.rar and it will be in there (the other rar file in that directory is for the 8 series liteon and the 0800 directory is for the version that turns your drive into a full time dumping drive).
The "_old" folder in there houses 1.51 ( Lite-on_iXtreme_v1.51-FINAL.rar ) which you can use to build a firmware compatible with wave 4 until such a time as 1.61 or 1.7 appear with wave 4 compatibility.
8 series liteon users are not so lucky (there is only 1.6 for you) although you do have the activate.iso option.
As for how safe: it disables checks although if stealth is available it will use it. Basically continue checking games with ABGX360
Also regarding it being useless now you do realise the 360 has been out for the better part of 4 years with nigh on 2000 releases of which only one you are unable to "simply" run.