[Q] Tmobile 4.2 to 4.4 - Verizon Samsung Galaxy S 4

I'm going to be upgrading my friends phone to 4.4
He's on stock 4.2 and he can't update. It's a verizon phone with Tmobile. Would I have to unlock the phone all over again when I install another ROM after root and custom recovery. I'm not sure how all this works. If it's already unlocked for T Mobile I don't want to erase the unlock. Is there anything to be aware of

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[Q] Want to jailbreak but dont know if boatloader is already unlocked

Hi everybody.
I just acquiered a note 2 (SCH-i605). And I found that it has been already rooted. I can use non verizon sim whith it. But i dont know if the bootloader is unlocked. I did some researsh but cant find out if there is a relationship between unlocked bootloader and the possibility of using another operator sim. The recovery is stock.
So i want to use "No You Verizon" program from AdamOutler thread http://forum.xda-developers.com/showthread.php?t=2272066
There are my questions:
- If the bootloader was already unlocked, will using the "No You Verizon" brick the device or cause any problem?
-The current android version on the device is 4.1.1 . After jailbreak, root, recovery with "No You Verizon" can i directly flash any custom rom (like AOKP kitkat or an AOSP 4.2 custom rom ....) without any workaround?
-If i do so (flashing a custom rom), will bootloader still unlocked?
Ps: My understanding is that to be able to unlock the bootloader i should stick to version 4.1.1 up to 4.2 .... of stock touchwise firmware. If i flash the stock 4.3 i wont be able to unlock the bootloader. im i right?
Thank you and sorry for my english.
I find my answers
Well, i think i find my answers. Maybe it will help someone else.
1- If i flash 4.3 OTA i will have a locked bootloader (forever or use safestrap)
2- To jailbreak, according to the version of my firmware i will use the corresponding Casual program from Adams casual thread
3- After jailbreaking, rooting, installing custom recovery i can flash any custom rom (directly in recovery, not with odin)
4- Depending on the custom rom i will need to update the firmware
Usefull threads are in Verizon Galaxy Note II Android Development section.

NEED HELP on How NOT to lock the Bootloader on a MDK s4

I need some help here, We (the wife and me) bought two s4's New a year ago and both was MDK, I Rooted and loaded a custom Rom, All was good until a few months ago when I wanted to put a Newer Rom on my phone, I started flashing this Rom and that Rom and then I had this problem! I had loaded a Rom or ????? that Locked my Bootloader and Now I'm unable to Flash Rom's
I'm really a Noob at this I only root my own phones and Need help here So I don't do it again to my wifes phone which Needs to be updated, it's on 4.2.2 MDK She has a New s5 and I'm taking her phone.
(1) Please tell me what I need to know to NOT Lock the Bootloader ???
(2) What is the Newest Debloated Stock vzw Rom Need Wifi Hotspot ??
(3) Steps for Flashing, I want to be sure I'm doing it right......
Thank You for your Help in Advance
Are you sure her s5 is mdk bootloader? The mdk bootloader was on the first released s4.
Essentially once you have a custom rom and and u locked bootloader, never take a verizon ota update. That usually patches known exploits to your phones bootloader and locks it down. What was the last rom you flashed that locked your bootloader?
Also, did you have a custom recovery installed? Can you get back to your custom recovery? If so, you're bootloader is not locked. You will have to wipe your phone clean and flash a new rom.
I will be working on her older phone, the s4 with the MDK bootloader and Now has become mine, Her new phone is the s5 and it's happily Rooted with S-S and a custom Rom.

[Q] For Experienced sim unlock

Hey I've never had a sim unlock device, my friend has a verizon s4 unlocked for tmobile she is still running on either Gingerbread or something that's very old lbs. I was wondering if I root and flash an updated rom with no bloat will it still work on tmobile? also can i flash tmobile roms or only verizon?
SkinnyBiggs said:
Hey I've never had a sim unlock device, my friend has a verizon s4 unlocked for tmobile she is still running on either Gingerbread or something that's very old lbs. I was wondering if I root and flash an updated rom with no bloat will it still work on tmobile? also can i flash tmobile roms or only verizon?
Click to expand...
Click to collapse
Verizon phones typically have unlockable bootloaders.
If you have the MDK build you can unlock the bootloader, flash custom recoveries, roms, etc. root and such. You would need to become familiar with using Odin. From your post it would seem you are confusing sim unlock with bootloader unlock. Sim unlocked merely means you can use the phone with any service providers. Provided the radios are compatible.
If the build is other than MDK you may be able to use Safestrap to load custom roms.
All tricky. Do a lot of research first.
All galaxy phones s3 s4 s5 s6 etc are world unlocked you can put a any Sim card in it and it will switch to global network your carriers will not tell you this information

can installing stock rom in an unlocked phone lock it again

..I was already told by a friend in xda group that if I again flash a stock rom in my sm-900p phone which I got unlocked for international GSM use (using from India) , it won't get locked again ...with all due respect to the friend who affirmed me already that it won't get locked ,can anyone else confirm that to me please ? I am not able to dare to flash the stock rom....since two days I am just waiting to take that step..presently I am using darkwolf rom but I want to flash with stock rom so that bootloader and modem gets updated and then on that version,I will flash this rom again ..that's my plan
It will not relock for international use. If it does for some reason, you can use Galaxy Tools to unlock again, assuming you root. But if it was originally unlocked either officially with Sprint or via root + Galaxy Tools, then it won't relock. If you were in the US, you would have to change some other settings to re-enable domestic unlock but international sticks.

Upgrading to lollipop from 4.4.2 with mdk loader

I am currently on 4.4.2 with a MDK bootloader. Originally I wanted to upgrade to Lollipop to use Magisk, but was informed that MDK is a fully unlocked bootloader so it wouldn't work.
That being said I would still like to upgrade to Lollipop. Without using the OTA method what is my best option? I have seen a few threads talking about different options, but most of them either don't mention MDK loader.
That being said maybe at this point in the phones life I just do the OTA update and loose the good bootloader. While having root is nice, I could probably live without it.

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