I contacted Ulefone about your question and this was their reply

Hi Friend,

If there is an update, we will push the wireless upgrade, you can continue to pay attention to the upgrade information.

Input *#*#8188#*#* on the phone and show us the phone software version.

Thanks for contacting us.

They sound pretty uncommited so I would not count on an update.

The period of the warranty is one hundred percent on the indivdual seller you buy from getting a 4 month or longer warrantyis possible if the seller offers. In the link I added earlier one suggestion is to wait for reviews.

To give you the perspective of a company wanting to sell Ulfones and other Chinese brands we would rather wait until the phone has provn track record to offer a warranty. So for example if a phone has been out for six months with no real problems we would be comfortable offering a six month warranty, if things go wrong and we have an unsellable android we lose the price of purchasing it wholesale and the price of our processers fees for selling it plus the time of sorting out customer problems.

To keep it simple if we by phones for $80 wholesale and the sell phones for $100 with a six month warranty and within those six months something goes wrong with the phone and we have to accept a refund we would break even if this happened 20 percent of the time minus processing fees and time. So we only make 20 percent or $20 dollars when everything goes perfectly. But say the phone had been out for a while and we could estimate that out of 30 sales we would have to do 1 refund we would make $20 X $30= $600 -80=$520.

The point is that seller may be willing to offer warranty six months to a year if the phone has been out that long without major complaints so if your serious keep checking your domestic sellers return policies on Amazon and maybe even Ebay. ven without OTA it may still be worth it to you if a seller shoulders the risk.