amann_2900 if you're getting 3G signal and not 4G sometimes it depends on your version of Mifi model some versions do show 4G signal I will give you a link to test a firmware if you'll be able to get 4G signal
@gaffer101 i think there is a site you can get those file... the link has been posted in this thread... try searching for it from page 1 you will see it
gaffer101 you should try and use another firmware to flash... it is possible that the firmware you used is not the perfect one for your model of mifi..