No thank, I dont have the time and knowledge for all this. It need some minimum understanding on how FW structure works. If someone here, in the forum can do it freely, why at FiiO no one want to do it ? I'm not the concepteur of your FW.
You are responsible for the smooth running of your product, personally, I think this is not the users that have to play with all this, manipulate or change your UI/FW.
It should be even forbidden to let users play in the WF structures, the risk that the product warranty void! This is a sure spot back to fix these small issues.
You must continue to work on this FW, on what the user requests, hope, so that they are completely satisfied.
Users ask and hope all comeback of some options, you removed at the expense of whatever.
FiiO, put OTG option back on track, and further improve our UI a bit, and everybody will be happy and graceful, and you will win back.
Personaly, Listening to faithful users, i think. is very important, to stay in business, and to keep good customers.