Guys here's the latest version of my 2nd most fav app, nUnlock v5.0
Once you run the app, you no longer have to use the hard slider button of your 5530/(5800 has one too??).
I really like the iPhone'ish unlocking with touch.
I found 3 versions online, attaching them all.nun. You'll need to sign these with SignSisTool to use with your phone.
For my own phone i signed all the 3 files with my cer & key and upload to my phone. luckily the first file i tried to install worked fine.
Enter 00000 for serial when it asks. and it'll register the product for you since its ******* already.
P.S. I'm attaching the v3.0 just if someone has issues with v5 then they can try it as last resort. For me, one of the v5.0 one installed fine, i think the one with shorter name.