Reason for Edit: New Step-By-Step as well as listing Offical Letcool Firmware site / listing changed noted since firmware 1.00 to 2.1
Official Letcool N350JP 2.1 Firmware Updatehttp://www.letcool.net/resources/support.shtml
Letcool N350JP 2.1 Firmware updatehttp://www.megaupload.com/?d=NZ6YMZ6H
Changes from 1.00 to 2.1
-SNES Keys Remapped (L+R buttons function as L+R buttons and no longer Volume Controls) - Firmware 2.0
-SNES Functionality has been improved slightly compered to last firmware 2.0
-Background changed from PSP style blue background to flowery orange background
How-To - Step by Step
1 - Download Rar from Mirror And/or Official Website
2 - Back up ALL Data from MC (Memory Card) and the Letcool
3 - Place files within the Rar (1.img,Config.ini,Images_RedBoot_201000427.img,isp) into the Root of the MC
4 - On the Letcool, go to Settings ( Briefcase Icon to far Right)
5 - Click on System Information
6 - Click on TF card
7 - A message will state to not turn off the power and/or disconnect the letcool from a power source. Click on Yes.
RECOMMENDED : Plug your Letcool into an the wall with an AC to USB connection. If you don't have one, it will still work but make sure your Letcool is fully charged.
8 - A new message will state "Start Upgrade now?", click on yes once again
9 - The Letcool will start the upgrade which is about 4-5 minutes, once completed, the screen will start to fade and restart.
10 - After Restard, the flash should be complete