I've followed the back opening instruction, and finally keep showing
anyone have faced this kind of problem?
I haven't seen that when my 801 was down.
Did you bridge the two pins when you plug'ed the USB into the computer?
If so, Windows should recognize it and you should be able to remove the RockBox and install the stock firmware - using the description.
There is of course a risk doing things like the "old" uninstall method (bridging pins on a chip in a player while power is on).
Does the player power on as normal, but just doesn't have any sound?
In that case it could be that you have actually "toasted" it, but it could also simply be that the DAC / DAP switch is set to DAC (unless it's a 601).
What model is it? And what works and what doesn't?
You just need an SD card with a .rockbox folder on it. You get this error because rockbox can not find this folder.
Some of the new slim 601s have a new screen with another resolution, and it's not yet supported by rockbox. If your slim Hm-601 comes with v0.10 firmware do not try to install rockbox.
So, I hope that you installed one of the newer versions with dual bootloader. If yes than you just need to connect your device to your PC, the original firmware will boot, and your PC will see the internal memory. Just put the original firmware there, turn off the devise and boot the original firmware once again (Power + any other button) and wait until the device finishes the update.
It is a surprice for me that almost nobody asked this kind of questions on the rockbox forum, where you can ask the developers directly. Many of you would not have problems that I've read about in this thread.
Also you can try this http://www.box.com/s/ejrm2fc43ojdv8knxed0 flasher.
Also try this to install drivers:
1) Press Start ==> Run CMD with administrators rights.
2) type in the CMD the following:
cd "path to the tools folder/drivers/amd64/win7" (or type the path to the drivers for other windows version)
3) pnputil -a rockusb27.inf
maquet, yes that is the reason. I keep wondering, why don't people read rockbox.org or ask questions to the developers directly. You would know that you don't need to connect pins it you have just read the theads or asked the developers. If you have installed the latest version with the bootloader correctly than just connect the device to the PC (the original firmware will load), PC will recognize the internal memory, put the IMG file of the original firmware into the internal memory.