Originally Posted by bimatots
i have galaxy a5 2017 (sm-a520f) that cant connect to 4g except i lock it,can u please help me ? i've tried to re flash but this problem still cant be fixed
Hi. I'm pretty sorry to hear about that. I had this mindbogling experience too, but on a different phone. Here are some solutions:
1. Make sure your carrier enables 4g on your sim. Maybe try calling *number# and check there.
2. Try to reflash a stock oreo modem image via download mode or if you have custom recovery (TWRP), flash it that way. I know the internet has this kind of files.
3. Make sure your device is supported by the carrier. I may seem stupid at first to say that your phone can't connect just because the carrier doesn't have your phone on the list, yet this might be the cause. In my case, I don't have VoLTE because my carrier simply won't activate it despite the fact my phone supports it.
It may seem frustrating this issue, but my reccomandation is to try with different sims to see if that would change the situation. If not, then I'm honestly clueless