I manually added the device IDs (Vendor:Product ID 18d1:2d02, apparently a.k.a. "Encore") for my old B&N Nook Color to libmtp's music-players.h, and subsequently I was able to manipulate the files on the device.
mtp-detect output attached.
Anonymous
the id is in libmtp since 2012 though ... whiuch libmtp version do you use?
considering done