Dingoo a 320 Maetel 1.2 firmware.
www.maetel.snk-neofighters.com

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Maetel 1.2 is a modification of Dingoo Digital China 1.20 firmware.

Changes :
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*3D games folder renamed as "Dingoo games"
*Interesting games renamed as "Roms"
*U disk renamed to "Internal Memory"
*Supports custom themes
*PSP icons and Win 7 backgrounds added
*English language as default
*Original Bootscreen/Logoff
*GBA Loading Screen changed
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Games and apps added :
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*430Mhz Overclock patch
*7 Days Salvation English
*Ultimate Drift English
*Decollation Warrior English
*Yi-chi King fighter English
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Emulators Added and updated (12/31/09):
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*ProoSystem = Atari 7800
*LynGOO = Atari Linx (Needs lynxboot.img in "game" folder, google it !)
*WS = Wonderswan
*SmsGGOO = Sega Master
*O2EM A320 = Odyssey2 / Videopac+
*NGP = NeoGeo Pocket
*MVS = NeoGeo Emulator with "Test Swith Enabled"
*GnuBoy = GameBoy/Color
*DOOEngine = PC Engine
*ColecOO = Colecovision
*MD = Mega drive with "Double buffer technique"
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How to install :
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The 100% safe and tested method is omgmog´s "Guide - Flashing custom firmwares to your Dingoo".
 
http://boards.dingoonity.org/dingoo-hacks/guide-flashing-custom-firmware...

*After flash the files wait arround 5~10 seconds to the Internal memory Window appears, put the "Game" and "System" folders indide.

Greetings :
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*Alekmaul, Crossidia, ilhan, Joyrider, jp, SiENcE, Subzero, Spiller and Multisoft for made the emulators :).
*Dingoonity and Dingoo-Digital for the info sites and files.
*omgmog for the install guide.