MyMPx.org - MODE button goes crazy

I have bought the mp4 model describes as QQ5-02R.

In the firmware info appears (in this order):
2006/10/30
9.0.50
ACT2097_s75
2006/06/12

The mode key was working correctly, but recently it works as backwards key and I can't enter in any mp4 function.

These are the features of my ebay mp4 player:

http://pic1.ebuyhk.com/gallery/us2qq502g.jpg

# 2.0''Screen.
# 65000 true color display.
# Support multiple music formats:MP1. MP2.MP3.WMA.WMV,ASF WAV DMA ..ETC.
# Play AMV film
# Support WMV, MPG, MPEG I , MEG II, MOV, and AVI Convert To AMV. format(Software included)
#
Built-in FM Radio : 87MHz to 108MHz
# Support ID3; The lyrics of Music Files can be shown on screen.(Software Included)
# Support BMP format picture to be view. Best view size: 128 x128 Pels
# Build in Memory Capacity 2GB
# memory dividable private space disk function
# play with 16 level shifting
# fm radio stereo:auto preset 20 channels&manual preset 20 channels
# support lyric display double interface,enble learning lyric.
# smart design for comfort listen: music fades away gradually when stop playing.
# manage with u-disk fold
# build in microphone, hi-fi record within ,support shortcut key record.
# usb2.0 (full speed)interface, top speed extends
# learning language convenient.digital repplay equipment.snippet a-b replay.contrast replay.16 level shift play
# the player is in 9-level battery monitoring system.
# preset eq for your music: natural, rock, pop, classic, soft, jazz, dbb .
# Support Multi Languages: English, German, French, Ftalian, Dutch, portuguese, spanish, japanese , korean. simplified chinese, trad chinese..
# built-in rechargeable li-ion battery via charger or usb port
# dimension: 73 x 43 x 10 mm
# System Requirement:

* Support Window 98 /ME /2000 /XP.
* User need to find USB driver themselves: Mac OS, Linux

CAN SOMEONE HELP ME? DO I NEED A FIRMWARE UPGRADE?

THANKS THANKS THANKS