I purchased Xolo ERA 4G mobile from Amazon. The android system is said to be upgradable, but till date I could not do so. i sent an e mail to the address, but till date there is no reply.There is no detail about service centres state wise in the manual. The mobile though boasts of latest technology is a poor product. I do not know why they manufacture such useless product and sell all over India. The battery performance is very poor and requires charge twice a day. The phone gets heated and hangs at times.