Yes for sure. Asking for the replacement from the sale agent in your country.

Y You need to use the old X5 firmware that support OTG.

Prefer B2.

Thanks for suggestion.   I've read manual and known X5 iGen can't use with K5 dock. But, It's great If this solution can use together by FW update.

I cant use K5 with X5 1Gen....!!!   Btw, Can FiiO release new X5 1Gen FW for making support K5?

Open box K5......   http://www.fiiothai.com/article-th-117377-%E0%B8%A3%E0%B8%B5%E0%B8%A7%E0%B8%B4%E0%B8%A7+%E0%B9%81%E0%B8%81%E0%B8%B0%E0%B8%81%E0%B8%A5%E0%B9%88%E0%B8%AD%E0%B8%87+FiiO+K5.html?lang=en

How about changeable LED color ? 

Is there any tools for mod fw ?

The second queue was tested today in Thailand. Btw, The first tester was really impress with X5II. He willing to buy the demo and don't want to send to second tester... LOL.....  

I don't have any RHA, BTW I have westone 4R,Shure 535, westone UM1,grado sr60,grado sr 125,grado sr 225,Alessandro MS1,Alessandro MS2,PSB M4U2,NAD Viso HP50,Koss portapro,Koss 4AAT,HIFIMAN HE300,Monster N-tune. Player FiiO X3,X5 with FiiO E12 DIY amplifier.   I'd like to try your RHAT10i.  ...

Is this the official fw?

After I replace AD8620. Test with GRADO 325is, GRADO 225, SONY XBA4- there is some distortion!!!!! UMMMM....... I take AD8397 back. for good result.

Quote: :)

Look so nice.

Can anyone pls suggest, My Grado 125 no sound out for left channel. After I didn't use it for 9 months, I've found its sound silent for left channel. It's cable is ok but its voice-coil has no resistance (When check with Multimeter).   What I should do....