Did anyone solve a problem with Apple Music complaining the device is rooted? It looks like it broke when I replaced a flash card, but I'm not sure. Not the end of the world, but it would be handy to make it work again. Upd: I've forgot the app had an update. Thanks @kumar402

Any opinions on RIGs?

AKS DAC1851HPA + JH50 JM is just an awesome combo. Very, very tasty sound. I guess I'll add a tube amp and will never look back.

Here's the review for the big brother: https://www.head-fi.org/threads/aks-dac1851hpa.888639/

It is possible, but requires a USB hub or a cable with built-in USB hub.

It's NOS.

I've ordered ~$75 one from taobao 3 months ago. Waited for a month, got no reply, refunded.

My DX90 was deeply modded by Sanmigel and I found Rockbox and Mango sound pretty similar, nothing synthetic. With latest rockbox, battery life is similar too. When DX90 is not modded, it's heavily dependant on all aspects of software processing including firmware footprint, etc. Even formatting...

You're welcome: sockets, plugs, resistor blocks.

  Knowles tool's diameter is slightly larger than #13 tubing inner diameter, no chance it will fit into #16.

Back in the day I used Sandisk 128G microSD with 2.3.0L1 firmware without any issues with latest rockbox. I have no DX90 anymore, so I can't check it out now.

Try formatting your flash card to exFAT, FAT32 whichever helps.

If you already use my (napych.com) rockbox build, you can just update .rockbox folder with copy and replace files. If you use Headwhacker's build, you should copy .rockbox folder to your player first and then install firmware with dual boot.

  Deleted, just in case. I guess I got this document by mistake.

Sorry, I'm not sure if I am allowed to post it.