For those who are thinking about trying those mSATA to ZIF adapter, here is a little info I found out:
Adapter #1
Adapter #2
Adapter #3
I believe #3 was the one previously tried by a couple of forum members. #2 looks like the same as #3, but when you examine closely they are actually not exactly the same.
Now the adapter I ordered a couple of days ago is the #1. I asked the eBay seller what the difference is between #1 & #2, and the reply is "yes,they are same function.The quality is different.".
Anyway, it will take a while to receive the adapter and we'll see how the the test results will be. Honestly I don't hold too high hope on this (especially wrt Rockbox given the feedback from other forum members who have tried) but just want to give it a shot using a different adapter.