Here is the response I got from Mr Zhang at Gustard, very prompt and informative, especially for me since I've been having a hard go of it trying to get the OCK-1 and the R26 to get along.
Hi Bryan
Thank you for writing again
You can download the 1v4 version here, right in the middle of the row
https://download.shenzhenaudio.com/#GUSTARD_R26/1
Please be sure to unplug the power cord of the R26 before starting the update operation of the streamer
Many of your suggestions are very valuable and we will improve them.
In China, Windows is the main PC system, and a certain proportion of Mac computers are used, but they all have Windows.
We will find a way to update and be more friendly on MAC.
Actually we have tested tidal connect. It works ok.
However, this is not an open standard and requires authorization. We have contacted tidal but they have not responded yet. Maybe wrong email?
We have the same concerns about QOBUZ.
If it is not authorized, it is in an illegal version and cannot be released.
By the way, when your R26 is connected to a 10M external clock. You can observe the 10M input BNC socket of R26 first, and observe whether the small hole in the middle matches the pin of the cable. If it is convenient, you can take a clear photo for our reference.
At the same time, you can consider using a small pliers to clamp the reed of the small hole to make it narrower and better contact the pins in the plug. There should be no problem.
Best regards
Zhang Shan