U all are trying dump.bin? if you backed up your firmware, maybe you need another firmware to start your mp player. you can update your mp with dump.bin, but you need full mp player booting. you can try updating with m600.bin then you disconnect your mp player. and connect again and wait, your mp plyer can connect to your computer as removal disk. finally you can update with your backed up dump.bin. It will work. if it is displays black or blue screen, it is not comfortable firmware to you mp player. Try shorting with memory chips if you cannot connect with recovery mode like ADFU mode for S1 mp players. then you can update with full FW. after that you can update dump.bin! Even it is not starting or turning on, or can't connect to the computer with recovery mode. there may have technical problem with your mp player. if it is happens, try changing Quarts with 24.576 Mhz or changing ATJ2085 chip or soldering again your mp players plugging! I found that, the mp players boot uploaded in ATJ2085 chip and firmware software uploaded in memory chip. There is many kind of chip of MPX players, like ATJ2085, ATJ2085P, ATJ2085W. ATJ2085W is often for MP4 players. Finally boot rom's version 3.0.00
Sincerely sak_cheegii
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SAK_cheegii@yahoo.com