iPod Nano 3G clone I3 MP3/MP4 Player

[Patcher]

Hi,
i am new of this forum and i'm here to report a serious problem:

since when my 16GB I3 Mp4 player Nano, 3G Apple clone showed a background with the hourglass on blue BGcolor and never load the main menu even after a bunch of hours, i've tried with a firmware "update". I simply used MP3 Mass Player Product Tools to upload a new firmware, starting with one found at mp4help , the TJD_918_BKS_ST7732.bin
Once i've flashed FW, my player works as USB Mass Storage Device only but no menu visible loaded... it's apparently dead.
My MP4 Player chipset is AK1025 8I001AB 0IB readable on the chip (not just the 16GB flash memory chip) by using a lens.
Then i tried with another two, XTC91N_SCC020_V5.1_L802_UT088G2M.BIN & 2.XTC91N_QY(5key)_V5_L802.BIN but same results, so i attempted to edit the firmware file saving the BIN file as "XTC91N_SCC020_V5.1_L802_UT088G2M_[1].BIN" & "2.XTC91N_QY(5key)_V5_L802_[1].BIN" (notice the "_[1]" suffix in order to avoid overwrite the original files). The only edits are FM Selection to "Yes"and Language (from Chinese P.R.C. to English) and of course i changed the brightness settings from 3 to 6.
I uploaded the first modified one and my mp3 player (connected with USB cable to pc and headset to one of my ears) went crazy: after 10 seconds i turned the switch on it shows only a lit white screen (no menu and no prompt), and another following behaviour is performed by pressing one of the interactive 5 keys simultaneously and quickly (expecially the Menu key, because those buttons work with a modified version of XTC91N_SCC020_V5.1_L802_UT088G2M firmware). Thus my pc detect the mass memory device, but as i stop pressing quickly any button, my pc stops to detect it as mass storage device and the ipod starts to play the first mp3 track stored in mass memory (even though in discontinuous manner) to be stopped after a few secs and then detected from my pc as Action USB 2.0 device (no Disk/no ADFU).
This is a weird behaviour and so i must disassembly the chassis in order to make a induced short circuit with tweezers or other metallic items by letting 'em slide alond the AK1025 chip side.
Doing so my pc detect this apparently dead iPod as "Actions USB 2.0 (HS) WinUSB ADFU device" but not as disk device (0 Disc/1 ADFU) mapped in the drives list. And of course i can upload a new firmware again. BUT WHICH ONE SHALL I PUT IT ON ???

Can you suggest me something in order to restore the original firmware ? After i've tried several times to upload fw and bin files, I've chosen the edit way but i am not a computer programmer and i need assistance about what to do in order to make one of downloaded fw's effectively compatible with my device.
Please Help Me !