2016-06-12, 04:13
[QUESTION]
After the first time I flashed my phone I could never make GPS work again, and the GPS signal was already weak before flashing.
Now I've flashed it again and when testing with GPS TEST app, it said the GPS was ON, so I left the phone running the application the whole night, when I woke up, and it still couldn't get a lock.
Have already followed the procedure of using engineering mode to download EPO and use the AGPS thing, the network doesn't seem to be helping at all, it finds the satellites, but the lock won't work. I've even opened my phone and enhanced the GPS antenna by soldering a copper wire followed by an aluminium (Isolated with electric tape), I know this method improves the signal because I've done that with the WiFi and SIM antennas, the signals were improved by 65%, but the GPS? No can do.
I suspect the phone isn't recognizing the GPS hardware, that I still have to do something else, like installing a "driver" or something. I not even get a weak signal, nothing, it's like my phone's GPS hardware never existed. Get it? I got a feeling that the phone isn't recognizing the GPS hardware.
Another question, does the BT (Bluetooth) code in SN Write software has something to do with it? Because after flashing the phone, it is necessary to configure the IMEI and BT.
[UPDATE 1]
It's a ROM issue, the upgraded ROM has something that is different from the ROM that comes in the Phone. Both ROMS are stock ROMS.
[UPDATE 2]
It's something related to NVRAM (Maybe)
[UPDATE 3]
In another forum someone said
"I think its country dependant, it works fine in China according to forums, I'm UK and it doesnt and has never worked, and can only get JB roms as there is no kernal available for even KitKat "
That country dependency happens because of gps.config file, the one that comes from the factory is settle to use chinese servers. Use Fast GPS APP to change the locale, or download GPS.config file and replace it manually, just go to Google and search GPS.config Your Country Name, don't forget to give proper permissions. It probably goes to /data/etc folder, can't remember well. Well, you should check it out.
This one here is not related to the problem in this topic, as I've already tested it, that's just a network aid. What we are doing here is hardware related, somehow the GPS is not being used, it's not the GPS device is burnt or something, it's just that the phone is not operating it.
[UPDATE 4]
Just found out that if I disable the SIM, the satellites won't be found in the GPS TEST and other apps that are used to get a GPS lock, and that's funny because I'm using Wifi and everything is configured to use Wifi.
What leads me to believe that the GPS is somehow using the SIM card frequency band.
As previously specified here
So I believe I'm closer to solve a problem that's been making many people not only lose hours of their lives beating themselves to find out what's going on, but also to solve that once and for all, but for that I'm going to need to help of people around here.
If the GPS is operating in the wrong band, I should configure the GPS to use a different band, right? OK, so how can I do that?
After the first time I flashed my phone I could never make GPS work again, and the GPS signal was already weak before flashing.
Now I've flashed it again and when testing with GPS TEST app, it said the GPS was ON, so I left the phone running the application the whole night, when I woke up, and it still couldn't get a lock.
Have already followed the procedure of using engineering mode to download EPO and use the AGPS thing, the network doesn't seem to be helping at all, it finds the satellites, but the lock won't work. I've even opened my phone and enhanced the GPS antenna by soldering a copper wire followed by an aluminium (Isolated with electric tape), I know this method improves the signal because I've done that with the WiFi and SIM antennas, the signals were improved by 65%, but the GPS? No can do.
I suspect the phone isn't recognizing the GPS hardware, that I still have to do something else, like installing a "driver" or something. I not even get a weak signal, nothing, it's like my phone's GPS hardware never existed. Get it? I got a feeling that the phone isn't recognizing the GPS hardware.
Another question, does the BT (Bluetooth) code in SN Write software has something to do with it? Because after flashing the phone, it is necessary to configure the IMEI and BT.
[UPDATE 1]
It's a ROM issue, the upgraded ROM has something that is different from the ROM that comes in the Phone. Both ROMS are stock ROMS.
[UPDATE 2]
It's something related to NVRAM (Maybe)
[UPDATE 3]
In another forum someone said
"I think its country dependant, it works fine in China according to forums, I'm UK and it doesnt and has never worked, and can only get JB roms as there is no kernal available for even KitKat "
That country dependency happens because of gps.config file, the one that comes from the factory is settle to use chinese servers. Use Fast GPS APP to change the locale, or download GPS.config file and replace it manually, just go to Google and search GPS.config Your Country Name, don't forget to give proper permissions. It probably goes to /data/etc folder, can't remember well. Well, you should check it out.
This one here is not related to the problem in this topic, as I've already tested it, that's just a network aid. What we are doing here is hardware related, somehow the GPS is not being used, it's not the GPS device is burnt or something, it's just that the phone is not operating it.
[UPDATE 4]
Just found out that if I disable the SIM, the satellites won't be found in the GPS TEST and other apps that are used to get a GPS lock, and that's funny because I'm using Wifi and everything is configured to use Wifi.
What leads me to believe that the GPS is somehow using the SIM card frequency band.
As previously specified here
Quote:Do NOT use this with the 900/2100 WCDMA v4.0 phone!
it will most definitely break your phone (no brick, but GPS & 900 Band WCDMA wont work anymore)
So I believe I'm closer to solve a problem that's been making many people not only lose hours of their lives beating themselves to find out what's going on, but also to solve that once and for all, but for that I'm going to need to help of people around here.
If the GPS is operating in the wrong band, I should configure the GPS to use a different band, right? OK, so how can I do that?