I've bought a few from advancedmp3players.co.uk and they have all been fine, but this one with Lurker's firmware and the extra programmes it installs, someone at their end deserves a bollocking.
What makes it worse, is that my last DX200 had a screen fault and the iBasso IT03 IEMs I bought to go with it, the wax guard fell off after less than a week! I'm sure Paul is as relieved as I am that I will never buy an iBasso product again.
Frankly speaking , looking at your situation i would not buy from this re-seller of used product rather then saying not buying Ibasso products again . Lol