Min freq can be set in settings. Currently at 300MHz.
Thanks for pointing out that USB mass storage is broken. I will look into it today
I use this for the moment, and it says it can mount usbotg as well.
https://play.google.com/store/apps/details?id=com.skidmrk.umswatcherotg
Sent from my GT-P1000 using xda premium