B593u-91 SIM is active but signal bar is empty

[richjohn840/]

Hello guys, I'm new here to this Forum and I really need help. I got my B593u-91 router unlocked working with all sim cards but doesn't connect 4G LTE anytime I place it on 4G the signal bar drops so I always use it stuck on 3G WCDMA, but it was so frustrating so I decided to upgrade, suddenly after a firmware installation the signal bar dropped empty, i tried using the reset button but it resets and still remains the same. Now I can't select 3G Mode. Please help me.

[wojteks]

Its time to send this router to recycle bin.

[richjohn840/]

My God that's sad to hear and really heartbreaking, it was just working on 3G few weeks ago, you mean I can't flash a firmware that can enable network selection mode? so I can pick 3G, I think it's now stuck on 4G and the signal bar is empty, I just wanna switch back to 3G please can you help?