EverSolo DMP A8 has two i2s modes selectable from the menu:
Rose RS130 has two i2s modes selectable from the A or B menu:
Mode A is compatible with PS Audio DAC and mode B is compatible with JAVS DAC.
Personally I have no problems with any digital player that I connect to my LAiV Harmony DAC as it automatically recognizes the compatible i2s
I recommend this HDMI cable, it’s cheap and high performing: Ricable SupremeMKII HDMI 2.0 Ultra HD 4K HDR Bandwith 29 Gbps
I have the same problem (reversed channels) with my iFi NEO Stream but have been using it happily with my R26 for years simply by switching the left and right channels on my amp when I’m streaming from the NEO. I know it’s not ideal, but it sounds just fine and I’m used to plugging and unplugging anyway depending on whether I’m using my integrated or my AVR. The Gustard also allows you to invert the phase if needed. Considering the cost of other dacs with configurable i2s pinouts vs. cost of ddc or shame of using a lesser USB input why don’t HI FI Rose/ r26 owners just use mode a and switch their left and right speaker cables? Just mentioning the obvious cause I read no mention of this in the thread and for some like me it could be deemed as just a minor inconvenience if you mostly stream anyway.
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After reading through this thread and careful consideration of all the various pinout diagrams I have concluded this. The Rose streamer (be it RS150b or RS130) has two I2S modes which basically swap the BCK and LRCK lines, all else being equal. This is why one mode will make sound with an external DAC and one won’t. These are the two PS Audio and JVS standards (Rose A-B). What I find particularly confusing is the RS 130 A mode seems to match the PS Audio pinout, but the RS 150b B mode seems to be PS Audio? This is where LRCK lines are on HDMI pins 7and 9 mapping to DVI. In regards to the OP, Gustard follows the PS Audio pinout standard. This is why @duffer5 got sound out of Mode B but not A. The problem with the Gustard R26 (and others) is that even though you now have the clock data pinned correctly, the LRCK phase is reversed, therefore the channels are swapped. The later Gustard DACs like X30 and X26III give you 4 I2S modes so you can invert the Data line and/or invert the LRCK lines. Basically you can swap channels or invert the signal phase by using these 4 modes. In practice with an X30 you would set the RS150b to Mode B and the Gustard to Mode 3 and you are all good. With the older Gustard DACs you would have to swap analog output cables to swap channels.
$20 worth of an Amazon DVI to HDMI adaptor + a 1 foot HDMI cable makes for a clean and simple connection for the 150b to an external DAC over I2S. Best to keep I2S cables as short as possible.
For connecting the older Gustards like the R26 to a RS150b you could get a standard DVI monitor cable, cut it down to 1ft and terminate it with that HDMI breakout connector like @StandardModel shows, but swap pin 7 and 9 to get the channels inverted. Should be good to go.