[Galaxy Tab S Android Development] THEDEVIOUS1:
D*mnit...i just typed up this informative article to explain whats going on & then the ENTIRE thing got deleted :mad::eek::(

Please keep checking this post as i will gradually add back the info as i go...for now i will post the zips/files & steps I've taken up to this point along with any other knowledge that u need to know and thx to [MENTION=2260490]sicarius128 [/MENTION] for pointing out the release of the south american model

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^T705M NG1 MODEM (Flashing this will enable the north american LTE frequencies...i have tested this myself & it DOES indeed work to change the bands)

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^T705 NF7 MODEM (this will put u back on the stock radio if u need it...although it is labeled NF7 it is the same modem that is included with the newer NG2 as well)

IF ANYONE IS ACTUALLY ABLE TO CONNECT AFTER FLASHING THIS THEN PLEASE DONT JUST GET HAPPY AND RUN OFF BECAUSE I NEED ALL THE DETAILS I CAN GET...THX IN ADVANCE

if u enter the dial code *#2263# (if this doesnt work then try *#0011#...i will include a link below with navigation instructions to get to the band selection menu) then select "LTE BAND" both before & after then u will notice that those available have in fact changed from "1.3,5,7,8,20" which are the stock/rest of the world values to "1,2,4,5,7,17" which correspond to the correct USA frequencies...at this point the mod MAY very well be working for some users but unfortunately for me my device still wont connect to the lte network for whatever reason so i need testers to see if this is an exclusive issue to my tab/sim or are there other settings that need to be changed somewhere. Below i will list additional steps i have taken & document other pieces of the puzzle i have put together for those of u who are interested,,,i humblyrequest that any devs or other knowledgeable users PLEASE post with your wisdom so we can get this working

http://xdaforums.com/galaxy-tab-s/help/unlock-aws-tab-s-8-4-lte-t2860001

^SERVICE MODE *#0011# NAVIGATION INSTRUCTIONS (please see post #2...there is an app called "advanced signal status" that makes this easier to access)

So...once i flashed the columbian modem & found that i still wasnt connecting to LTE even though the NA frequencies were in fact found in the aforementioned menu i tried a few more fixes. After doing some reading i ran across a file in the "system/etc" folder named "lteon_netlist.xml" which seems to contain an index of whitelisted lte networks from around the world & upon opening it i noticed that ALL of the north american companies were missing. i found the the file of the same name from the columbian rom & sure enough it included AT&T as well as t-mo & other domestic services. This almost SURELY seems to be an important part of the problem but even after replacing this file my problem persisted...i guess i should mention that i'm on straight talk with an ATT compatible sim & it may not be important but i tried my sim in a LG phone & it worked after i forced it to LTE . To further complicate things...it wouldnt work on an ATT branded note 3 & the sim card from the same note 3 wouldnt connect to lte on my device either even with proper apn settings

So with all of that said...a few more failed attempts i've made include the following

1. added various apn settings including KNOWN working values on other devices

2. deleted "persist.radio.lteon" from the location "data/property" or change its value from false to true

3. flashed the kernel from the colombian rom & even created an entire rom from the firmware in hope that some combination of the files it contained would cause it to connect...everything was fully functional after the fact but alas no LTE

4. did a REAL factory reset with the stock recovery which even erases the contents of the internal sd card

5. altered a note 2 zip which contains ATT csc files inside which interesting enough does change the device product code to T705NTSAATT according to the app "phone info" (links to zip & app below)

6. Used the band selection menu mentioned above to force lte bands only but not only does ths not work it desnt seem to survive a reboot either...i also used the app method to do the same (link below)

7. Last but not least...i have tried to flash the bootloader & YES i'm aware of how dangerous this is which is why i wont be uploading the zip here although i havent yet found a way to get it to overwrite which is one of the question i need answered below

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^LTEON_NETLIST.XML (this zip is NOT flashable because i was being lazy :silly:....unzip then replace the file in "system/etc" & dont forget to change permissions to 0644 or rw-r--r--)

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^ATT CSC (please be aware...this will show the csc version as N7100ATTDMB1 but doesnt seem to cause any issues)

https://play.google.com/store/apps/details?id=com.cc.signalinfo&hl=en\

^ADVANCED SIGNAL STATUS APP (used to determine your current network connection...can be used to force to a certain type or to enable/disable individual gsm/wcdma/lte bands

https://play.google.com/store/apps/details?id=org.vndnguyen.phoneinfo&hl=en

^PHONE INFO (provides a ton of info about your device...including a list of all secret codes as well as a csc changer)

couple of quick questions for anyone who can provide answers or otherwise assist...thx in advance

1. [MENTION=6019042]bentee20[/MENTION] [MENTION=5494170]crzcraft[/MENTION] does choosing the particular bands or lte only in fact force the mode on your devices...i'm aware when u use the app method that u will need to change the setting every boot. Just out of curiousity...could u guys post your location and device/rom details

2. [MENTION=4674935]vovochka-s2[/MENTION] did u ever find a 705 pit file or can anyone else please provide one for us?

3. Directly related to issue 2...has anyone use hemidall to flash there tab & if so could u please list the steps as well as version u used

4. i dont expect any other users to attempt this at least until i can confirm it fixes things...CAN ANYONE PLEASE PROVIDE A PROVEN WAY OF FLASHING THE BOOTLOADER ON NEWER GALAXY DEVICES? It wont flash through odin do to security reasons (neither would the modem file file but it flashed fine using twrp)...i have tried installing it through recovery but after reboot nothing seems to have been changed according to the phone info app

the input of [MENTION=3511708]UpInTheAir[/MENTION] (particularly would like your opinion on #3 & #4 above...yeah i know bro but i'm so close & this is the level of desperation i have reached :laugh:) or [MENTION=1473204]edan1979[/MENTION] would be welcome although i dont think either of u are actually in the states so im not sure how important this issue is to u if at all...to answer your question from the other thread a few weeks NO i 'm not aware of the exact location of the network selector list but i did notice that it disappears from settings after using the att csc zip so i might spend some time to track it down tonight even though i came across an easy way to change it back

[MENTION=6007867]Hakams[/MENTION] the above modem should fix your issue if u never figured it out...please report your results