Low wifi signal - Galaxy S 4 Q&A, Help & Troubleshooting

Hello
Recently got a refurbished S4. Actually i can't know the exact model.
In download mode. It says it is the L720T model (sprint). But i can't instally any sprint rom.
I could install int i9505 roms (jfltexx). I tried updating lollipop modem & bootloader but i could only install Sprint modem (Updated from L720VPUGOH1 to L720VPUGOK3)
But the real problem is that I got very poor wifi signal. When near the router,it works. As soon as you walk bit away ,the signal drops significantly.
I'm still wondering wether it's a hardware or software issue. And i'm not sure about which version i got if i wanted to flash stock firmware. How can resolve this ?

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No 4g on K320S after flashing HK v1 custom rom

Hi, I just got this phone a few days ago and immediately rooted it then flashed the HK v1 custom rom for my K320S. I recently realised that my phone does not go on 4g even though my other phone with the same carrier does. No matter how strong the signal, I'm not going into 4g. I did manage to get 4g signal in the few hours I played around with the phone before rooting ad flashing the firmware and I concluded that it was probably the firmware that is restricting my 4g. Does anyone have any idea how I might be able to enable my 4g again?
P.s. I couldn't find anything when I searched
Cheers
XyberG2

[Q] Firmware downgrade

I wanted to downgrade the firmware on my galaxy S4 I9500 from BMG9 to BMG1 for the battery life because even when I bought a new original battery from samsung still the drain is high but the phone doesn't get hot as before. When I install the older firmware, the phone loses the mobile network signal and doesn't connect even if I choose the network manually so I have to reinstall the BMG9 again for it to work, can anybody help me with this situation? Thanks
Edit:
I found a solution through flashing the MG1 firmware with MG9 modem through odin but will this work as MG1 or the modem is controlling all the battery drainage and cell signal. I also believe that the problem came from a faulty imei??

[Q] Firmware downgrade

I wanted to downgrade the firmware on my galaxy S4 I9500 from BMG9 to BMG1 for the battery life because even when I bought a new original battery from Samsung still the drain is high but the phone doesn't get hot as before. When I install the older firmware, the phone loses the mobile network signal and doesn't connect even if I choose the network manually so I have to reinstall the BMG9 again for it to work, can anybody help me with this situation? Thanks
Edit:
I found a solution through flashing the MG1 firmware with MG9 modem through odin but will this work as MG1 or the modem is controlling all the battery drainage and cell signal. I also believe that the problem came from a faulty imei?? Also noticed that the drainage is still a bit high.

S4 i9500 no network bars

Hi, I have my friends s4, he has Android 5 offical samsung rom, he installed it by him self, then he switched back to to 4.4.4 and network bars not showing, i guess it needs a new modem to be flashed, can you guys give me a link?
http://forum.xda-developers.com/galaxy-s4/general/i9500-easy-to-downgrade-official-t3036258

Do different official I9505 firmwares have different modems?

I am currently studying in China and a friend of mine from France came back after the last holiday with a GS4 I9505 from home. Apparently she was having trouble getting it to work on Chinese networks, so she took it into some place to have them fix it. Apparently they rooted it, changed the ROM and did who knows what else. After that, she said the phone not only wouldn't connect, but it was also very unstable, crashing constantly. I told her I have a GS4 (I have the I9505G) and could help her restore her phone. She wanted the regular stock Samsung software, no root or anything. So I used Sammobile.com to download a French (NRJ) version of the 5.0.1 firmware and flashed it to the phone. It appeared to work well, but when I put my China Unicom SIM in it, it would only connect to 2G. On my I9505G with stock 5.0, 3G connects without any problems. According to the Wikipedia GS4 page, the 3G frequencies used by the China Unicom variant are also used by the I9505 and I9505G. So when using the same SIM, I assume they should both have access to 3G. Would the French firmware be interfering with this? Do different firmwares have different modems that would be affecting this?
At the very least, I was able to restore the phone and get it to connect to 2G, but if I can completely fix the phone for her, I think that would be preferable. Any advice or shared knowledge about this issue is much appreciated.
i have S4 three UK version and i downloaded uk lollipop with different csc and pda and modem, but still it works like a charm

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