I really thank you for this guide. I have just bought a cheap mp4 player, the first one for a little girl. I was too lazy to check the current prices, so I bought from ebay a "16gb" player for 30 euros shipping included from Netherlands. Reading errors soon appeared, files with nonsensical metadata (date, size of several gigabytes) showed up in a new repertory I had just created, directories began to duplicate...
It turns out it is a 4gb player, not so bad after all, but I have written back to the seller (grazy*gadgets)so that others are not ripped off. I see that he has other players in stock :
★ 16GB Mp4 / Mp3 / FM / VIDEO SPELER Zwart + USB Kabel Oortelefoon Handleiding ★ | eBay
As a side note, I followed the old guide (
http://mympxplayer.org/image-vp52076.html) and succeeded to format with MP3 Player Disk Tool the player back to its original 4gb NAND size. At the beginning, the memory appeared encrypted and couldn't be formatted on a windows PC.
I have registered here to thank the admin and let the people know that such a 16gb MP4 player is.... dubious.