I thought I had just bricked mine. The update itself seemed to have gone through properly, but I never got the option to factory reset. The main screen restored for a second and then went back to the basic ibasso load screen, flickered a little occasionally and nothing else. I eventually reset it, removed the battery etc. with no luck. So I followed the suggestions on the previous page on how to break into recovery mode and reset from there, that did the trick.
Reprinting here to save time in case anyone else runs into the same issue:
1, press and hold both of the power button and the Vol + button for 5 seconds, then release it.
2, you will entry the blue recovery mode.
3, you can use your 3.5mm headphone
jack to touch the coaxial jack and flick the hold switch to operate on this recovery mode.
4, select the wipe date/factory reset (click the power button to select)