Okay, so I tried once again updating from the oldest firmware to the latest sequentially (as described here). I could not connect and update controller in any of the older updates. As soon as I upgraded from R.124 to R.026, the first issue (no visual output in the goggles) happened again. Nevertheless I tried connecting controller to the Compute Pack. This time, it looked like it's doing something, but since I couldn't see any info on the installation process, I disconnected after about 5 minutes. Since then, the controller changed its behaviour - it was flashing red light and beeping. So I tried downgrading the OS from R.026 to R.124. Finally, after that step, I was able to update and connect the controller.
Therefore, the second issue seems to be resolved. However, the first issue (no visual output for the R.026 update) is still present. I tried once again uprading from R.124 to R.026, but unsuccessfully. So I'm sticking to the R.124 update for now.
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