My way was the same :)

With BD DT 990 Pro/250 (even with its "coloured" sound) I don't think so and stay on the 2.1.5 L2 in moment. 

Many thanks for your answer. And about bolded text - I'm from minority of people :) P.S. And - anyway the 2.1.5 L2 sound is still mine :), just tested now new FW again.

But.. with some times listening of the new 2.2.0 L0 my choice is 2.1.5 L2. Its sound is mine indeed. And as I think - sound of 2.1.5 L2 is more real (neutral) than in the new FWs (also modded by Lurker).  Anyway many thanks to iBasso!

T.R.A.N.C.E., as I know you have modded DX90 version (by Sanmigel) and your opinion about the sound of the new FW is very useful for me. As I see (with a little of listening time with the new FW, Lurker's version (thanks to Lurker again!!!) its sound is really balanced, but as I see - the sound...

I wrote about the deeper sound (for me) with the 2.1.8 and turned back to 2.1.5 L2 (many thanks to Lurker again!). But it depends with the headphones, I have a little horror :) with my DT 990/250 even with the 2.1.5 FW. But (as I saw) my DX90 was modded and its sound isn't stockable. 

I'm very happy with (my player was modded previously as I wrote) the 215-235 at the HG and with the DT 990/250. Just try to find yours.

Many thanks to @Visir for info about Jubatec battery! The good replacement of stockable as I see. And with real 2400 mAh vs 2100 in stock version. But, the best fish swim near the bottom :)

Without the 1st of April, I must to give you some compliments... I had some times to directly wrotes to iBasso and even received some parcels directly for me. Many thanks to your (not just personal for you - at all) attention! Not for answer course.

May be it is USB (or computer generally) problem, but with 2.1.5 L2 I never had this bug.

Are you listen music from card or from main memory? Try to use player's main memory, I think this bug is concerning with the card.

Does nobody paid attention to this? The aluminum back cover with one hand is scratched (I mean the sharp corner of the cover to the main body and with one side only, it's ok on the another side).

But as I know the audiophile is a very strange person with his own of mind :) and (without really beautiful girls in Greece) I (temporary) turn out myself about the Pono with phrase "the need for sufficient". It's just my phrase :)

I'll try to answer in the context of. But with the binaural sound with DT990 in my ears :). Binaural - it's just an experiment for me but isn't my sound as I see. Very nice to listen a channels differences and that's all for me. But my mind is still out while listening :))), looks like a test...

Very interesting, thanks! Because my DX90 is modded too as I saw... it's the thing for thinking indeed... Means Pono. I'll try to kick our famous seller in Moscow about listen it.   But what about dimensions of Pono and its usability? As I see it's much bigger than DX90.