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Rockbox for iBasso DX50 dual boot with stock firmware
Mar 13, 2014 at 4:49 AM Thread Starter Post #1 of 2,020
headwhacker

headwhacker

Headphoneus Supremus
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Rockbox for DX50 with cwm recovery

Thanks to xzcc for porting Rockbox to DX50

Latest build and install steps from Cholero
 

Unofficial Installation instruction for Rockbox on iBasso DX50

prerequisites: A DX50 with any stock firmware. If you have an older rockbox installation with CWM (= all before 02/25/2015), follow first the purple reverting instruction below.
There are 2 different ways for  the update: choose either brown (microSD fat32) or green (internal storage)
  • Download the files:
    • Firmware 1.9.4 including the rockbox dualboot app. (older version: 1.9.3)
    • the latest rockbox build* from the official page:
      this is a development build but problems are rare
       source code: rockbox git tree   -   changelog
  • connect your player to the computer to have access to its storage 
  • extract the update.img form DX50Firmware...zip to the root of your
    a) either microSD card (which has to be formatted to fat32)
    b) or internal storage
  • extract the content of the rockbox-build-zip to the root of the internal storage of your DX50 (it contains one single folder: ".rockbox"). If the file manager asks questions about merging or overwriting because of an older rockbox installation, overwrite all existing files (settings won't be lost)
  • Update the Firmware (brown or green, as above):
    a) reboot to recovery: Power off the device, then power it on while you are holding vol+then select "apply update from SDcard"
    b) Boot the official Frimware and select: Settings / Advanced / System update
    -> Firmware 1.9.3 containing the rockbox dualboot app will be flashed (update.img)
  • that's it, you're done :thumbsup:
 
-> to switch between Mango and rockbox, you have to put the "lock" switch to "locked" position when you are booting then the dualboot selector will appear
 
Revert CWM to stock recovery (if you had an older rockbox installation)
  • download stock recovery
  • copy the zip file to the root of the internal drive of your DX50 (or where you usually put cwm-zips)
  • Reboot to cwm: Power off the device, then power it on with holding vol+
  • Flash stock recovery in cwm:
    install zip from sdcard / choose zip from sdcard
 
 
* or an optimized custom rockbox build containing these patches  "Modern User Interface" ps10, User selectable hold switch mode ps13, "Debounce" patch ps1
can be dowloaded from zippyshare
 
 
 
 
Click to expand...

 
 
 
Theme Installation How-To (Courtesy of Cholero)

1. Download any Theme you like from the official Rockbox page as a packed zip:
http://themes.rockbox.org/index.php?target=cowond2

2. Connect your player to the computer and open the internal memory (usual name: DX50). There should be a folder "rockbox", open it

3. Open the downloaded theme zip file. In the zip file there is a folder named ".rockbox" (yes, with a dot)

4. Open the ".rockbox" folder in your theme-zip and extract all the content to your "rockbox" folder on your player
you're done, now you can select your new theme in Settings -> Theme Settings -> Browse Theme Files

Click to expand...

 
 
 
Themes collection compiled by Deho.
 
Rockbox themes
Click to expand...

 
Mar 13, 2014 at 5:03 AM Post #3 of 2,020
xzcc said:
  >move settings back to /sdcard
a little bit difficult, have to think how to do it best first
 
 
>Any news about battery performance:
looks not worse than mango to me - low load in 'top', hours of playing
 
 
> Does volume up/down button affects volume in HO? It does not seem to be the case for me. I had to adjust volume from the menu. It appears LO has a fix volume.
lineout should have fixed volume, no?
 
Click to expand...

 
Setting on SD? is that good? what if you have multiple SDs?
 
Mar 13, 2014 at 5:18 AM Post #5 of 2,020
Thanks, I'll try it out soon
 
Mar 13, 2014 at 7:38 AM Post #9 of 2,020
Does Rockbox support sampling rates higher than 24/48 on DX50? Not sure if anyone has answered this question before
 
Mar 13, 2014 at 7:50 AM Post #10 of 2,020
Rockbox plays anything but downsamples to 16/48 before sending it to the dac as I understand it
 
Mar 13, 2014 at 10:29 AM Post #11 of 2,020
varoudis said:
Setting on SD? is that good? what if you have multiple SDs?
Click to expand...


/sdcard is the partition on the embedded MMC that is exposed over USB. It's what we typically refer to as the internal storage on the device. This is a legacy of the early days of Android where a uSD card slot was part of the hardware specifications and a microSD card was necessary just to use the OS. When Google eased the uSD requirements they chose to use a chunk of eMMC as the /sdcard file system to maintain backwards compatibility with older applications.

Removable cards are usually mounted as /mnt/ext_sdcard or something similar. DX50 uses the /mnt/ext_sdcard mount point.

Correction: DX50 uses /mnt/external_sd.
 
Mar 13, 2014 at 10:49 AM Post #14 of 2,020
nc8000 said:
Rockbox plays anything but downsamples to 16/48 before sending it to the dac as I understand it
Click to expand...


Correct. And then the DAC oversamples so that most aliasing artifacts are pushed above 20 kHz where they're inaudible, and then it uses a low pass filter at 20 kHz to cut those artifacts off. All that a 192 kHz file does is skip the oversampling step. You still get the 20 kHz low pass filter to remove high frequency artifacts. That's why nobody has bothered implementing so-called high resolution playback in Rockbox. It's just going to be cut off by the DAC. This includes the Wolfson WM8740 chip in DX50. You can read Wolfson's own spec sheet here:

http://www.wolfsonmicro.com/documents/uploads/data_sheets/en/WM8740.pdf

Citing note 2 on page 7:
2. All performance measurements done with 20kHz low pass filter. Failure to use such a filter will result in higher THD+N and lower SNR and Dynamic Range readings than are found in the Electrical Characteristics. The low pass filter removes out of band noise; although it is not audible it may affect dynamic specification values.
 
Mar 13, 2014 at 10:50 AM Post #15 of 2,020
Copied over from the main DX50 thread.

xzcc said:
>move settings back to /sdcard
a little bit difficult, have to think how to do it best first
Click to expand...


Understood. Symbolic links is just the quick and dirty hack that I can do without changing the source code.

>Holding the FF and RW buttons doesn't repeat in menus.
and should?
Click to expand...


Yes. For example, on the Clip series, holding "down" continuously scrolls through menus. I expect similar behavior here.
 
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