Can these problems be fixed in software and can user update the firmware themselves?
Or is this more a hardware-issue?
How can customers tell the difference between the updated and non-updated devices?
there are two small problem,
1, background noise, it was caused by DC power supply. it is small and it doesn't affect normal using , I can make sure
2, at low frequency for square wave form, when you amplify 1000 times, you will find that there is little no sync. this don't affect normal using .
excep those , otheres are not my problem.
because those are small problem and don't affect normal using , so we gradually update those things. now we have already update 2 problem, if you order now
thank you for your concern
have a nice day