I'm really sorry, but this chip (HY27UF081G2M) is a 128mb one :cry:
Check this two links:
http://www.mympxplayer.org/hacked-4-...yer-vt839.html
http://www.mympxplayer.org/hacked-pl...ay-vt1883.html
It's imposible to have an 8GB player, the chip was hacked so that the computer would show that the device had that amount of memory. When you tried to repair it with the Dead Player Guide, the memory may have "lost" the hack, that's why now you are seeing a 128mb player..
What you should do now, is to try every firmware you see in the website, in order to get your player working..
If I were you I would firstly ask the seller a refund and see which is his answer..
Good luck!