Although I am very hesitant to recommend this, but some owners such as
@smashdownbabylon have reported improved UAD compatibility after flashing the Thunderbolt firmware to enable Thunderbolt Bus. Please refer to these two posts:
Why am I hesitant to recommend this procedure?
- Because flashing Thunderbolt firmware involves risk of electrical and physical damage.
- Because flashing Thunderbolt firmware is not something to be rushed; it requires several hours of patience.
- Because all instructions in the Tech Talk section of Post #1 must be read two or three times.
- Because our eyes must be able to focus clearly at very close range. And we must have steady hands to attach and detach the SOIC clip.
- Etc.
So it's best to exhaust all other possibilities first.
@jiffyslot has been very helpful in these matters.