Denafrips FPGA Firmware Update

Agreed. To make it worse, now my Iris DDC is no longer working properly with I2S output to the T-Plus DAC running updated fw V3.7. I was told by Vinshine that my DDC itself needed a firmware fix since it is "old" (bought new in Oct 2021!). Still waiting for that promised DDC fw fix...

I was hearing micro-distortions (which has been reported by some as well, not all) with the v1.4 in my Pontus II. I probably did not give it enough time for burn-in for the sound. I could not live with micro-distortions. 

I have a Pontus ll that is 2years old now. Have not updated the firmware. I love it's sound.

What the heck are micro distortions???

FWIW I found the v3.7 on my TP to be better than v1.0.  I also have an Iris that while if functions properly playing over I2S, I need to reset the pin out to switch between PCM and DSD.

I also found the USB is now better than the I2S (wasn't so with v1.0) so I am keeping v3.7.  I have a Lampizator Golden Gate and use that as a reference to judge the change from v1.0 to v3.7.  

I suggest giving it a try, but let it burn in for a few hundred hours before listening.

Also I was using NOS, now I find OS with sharp filter cleaner and more pleasing especially with 16/44 files.

@anzaanimalclinic Thanks for sharing your experience. I had reservations about TP running V3.7 fw at the beginning due to added brightness to my system even after hundreds of hours of burn-in, although it did give more details, focus, and transparency to the sound. A week ago I changed XLR IC from pure silver to copper (Oyaide TUNAMI TERZO XX V2), left it on 24/7 with V3.7. I listened to the system again this morning, it sounded much better, the brightness has been tamed. Yes, I also like the OS mode now as it is more dynamic and 3-D,  the sound in NOS mode in comparison is somewhat muddied and flattened.  I prefer slow filter for my system. It just sounds more natural.  This was done with USB connection only, I didn't compare with Iris DDC I2S connection since I don't like having to switch I2S settings between FLAC and DSD playback. I'll give the DDC away to a friend ;)