Thanks to Devhook, I still run only the 1.5 firmware for my PSP. Yesterday, since my wife was using my laptop, I had no other option but to browse the net on the PSP. I was surprised that I could not connect to my APN using my emulated 2.71 firmware. It is quite sometime since I used the Wi-Fi on my PSP but I could not recollect an instance where it failed to connect to my home network. I use WPA AES encryption and was repeatedly getting a stupid 80410D05 error message. If I change the encryption, I got a nice 80410D06 message! What an improvement!
The fix (after some extensive Googling) is simple. This seems to happen to folks using the linksys router. Login as administrator in your router, go to Wireless-> Advanced Wireless Settings. You’ll see a combo box for Basic Rate among others. Change the value from default to 1-2 MBps and save your settings. Now try reconnecting your PSP. It should work.
My Two Cents 
Thanks for the tips
WHAT DO MEAN BY ROUTER IN SETTINGS ON THE PSP?
Router as in wireless router. Not PSP. This fix does not involve changing anything on your PSP.
OKAY BUT HOW DO I LOGIN AS ADMINISTER IN THE COMPUTER?
SORRY I MEAN ADMINISTRATOR.
@FLAMER1
Please read the user manual of your wireless router. The userid/password combo is different between models.
please i need psp 3.71 downgrade manager and psp umd generator
What if the psp wont link to other games either? I dont have a wireless router to play with i just wanted to connect with other games
yeah, i run the latest DaX firmware i can find. this awesome program called eloader makes it so i can run programs as 1.5 or anything else. i love it.
It all depends on the firmware you use.
my psp version is 6.20 is that why it says an error im definatily going to find out
wireless routers are very necessary nowadays because we do not want so many wires running around the home *-;
Thats an awesome article, helped me a lot.