Cannot update Watch from 6.2.1 to 6.2.6

My S3 watch is not able to update since 6.2.1, during the 6.2.6 update (from the Iphone - running 13.6 public beta) it says "unable to verify update because you are no longer connected to the internet"

From the watch I get a more general error message.

Meanwhile I tried all the (dark)magic the Internet suggest including manually deleting the update files, or restarting devices in a specific order, unpairing-pairing, hard reseting, erasing and restoring as a new.

I took a look on the logs the watch produces (mentioning only those, that look important since this forum does not allow pastebin urls):

3f01c000 : [Info]   updaterlog: SE: [1593507364.148] [INFO] (null): Error Domain=SEUpdaterErrorDomain Code=31 "[ERR] SEUpdaterExecCommand: Hardware still not in a valid state: 3 31" UserInfo={NSLocalizedDescription=[ERR] SEUpdaterExecCommand: Hardware still not in a valid state: 3 31}

3f01c000 : [-[UMEventRecorder recordEvent:information:callback:]] (applyFinished) - {

  currentNeRDOSType = "Darwin Recovery";

  currentNeRDOSVersion = 17T620;

  failureReason = "MSU 2 (could not obtain device identity information);";

  nerdBrainVersion = 17T620;

  result = "MSU 2";

I cannot restore it to any earlier state, neither update it. What do you think, applying the first 7.0 public beta would help?

The phone itself is on beta for a year, never experienced any update issues ever since.

Or it would be better to leave it as is for a while, not to risk bricking.

What is wrong with it? Any idea?