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If the screen display like the pictures showing, the reset hole should work.
There is a small hole by the side near power key. The hole has no mark. It's RESET key. Push it with a slender stick.
In future, I can send you new firmware for test by email. We are working on it.
China factory is world's factory. Many good IEM. But you can not pick the nice one from thousands goods.
K240 is good, balance.
K701 too bright to me.
K550 never heard.
I only know this brand with their tube amp.
Portable machine, this is the first of them?
Amazing picture. May you talk more about PAW Gold?
I think the 65th is much better.