You have to:
- 1) use cwm to return to stock recovery (stock_recovery.zip from package you downloaded before)
- 2) use stock recovery to flash any update.img"
In the files you downloaded to put RockBox ON your DX50 there is a file called "stock_recovery.zip." You need to put that back into your device
so that you can then reinstall the stock firmware (1.2.8). I took a micro sd card, took everything off of it, put the recovery zip on it, and plugged the
card into the DX50. Then I (think I) rebooted and fussed with the touchscreen until I got it to scroll to the place where I could open the zip from the external card.
That was the hardest part, as the touchscreen was fussy and it was hard to get it to the right place. Once you accomplish this the device reboots and now you have
a stock recovery again (to install RockBox you have to first install a non-stock recovery). Then you make sure the device is on, plug it into your computer using a USB cord,
place the firmware .img in the base of the machine, and run update as normal. Or, I suppose, you could erase the now-used zip and replace it with the img and update that way using the micro card) if you can't get the computer to see the DX50. .
It took a lot of fiddling and some swearing to get it to work, but it did. I use a Mac, but it should be the same on a PC, especially since I used the zip on a micro card and not the computer to do this.
Edited by olddude - 6/15/14 at 3:23pm