my huawei honor 7 dual sim issue

[AC Question]

hi!
i'm facing a weird problem with dual sim network. sim 1 or sim 2 whichever is assigned with 2g/3g/4g option gets cellular network only and the remaining one shows 'emergency calls only'. assuming that this is an software issue, i've changed the rom using HiSuite; but the problem yet prevails! the phone was okay for last around a year and this issue just happened couple of days back...
is there any solution/suggestion to get rid of the problem? thanks in advance!