First of all - sorry for my English
I have (had) PMP based on SUNPLUS spca536 processor.
There are a lot of bug in it's firmware and I cant use this thing in normal case.
So I want to test other firmwares or combine original and other firmware or correct disassembled code myself.
First of all I need to know - how I can reanimate killed player. I filled in my pmp other firmware using ISP_v5.2.2 tool. Firmware filled ok but player is now dead. I was ready for this. There are some instructions on chinese sites that explain how to fill firmware to dead spca536 based player. You need to short SDRAM pins 28 and 34 to block DRAM and player can be detected by pc. After it you can use ISP program again. So bootloader in spca536 always alive, but player still dead. I filled original *.bin, dumped bin, bins of other manufactures. Nothing helps me. So I need info about typical firmware organization for devices like my and memory addresses. My device is common mpm - mp3, asf player with camera, FM and SD slot.
Also I know one site (in russian) where do the reverse engeneering of firmware one player like mine.
There are emulator and disassembler but problem of flashing dead player is unsolved.