Hi!
Bittex support don't respond to the ticket. Apparently U market will be removed tomorrow. Withdraw your funds from Bittrex.
Trading is possible on C-CEX. I'll write tomorrow to Yobit support about issue with wallet. I have plans for the spring, I hope to be able to return to Bittrex.
P.S.: UWallet for Android will be updated on the weekends.
Only a few days left and U coin still marked for delisted at c-cex. No much trading activity there, but still have little volume. May be just need little support to get minimum dailly volume 0.2
BTC. I believe U coin will not delisted from c-cex because you're always active here to support your coin.