how do i upgrade the bootloader - MDA II, XDA II, 2060 ROM Development

can anyone explain to me how to upgrade the bootloader

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[Q] Can I unlock the bootloader from ICS ?

I upgrade the rom to the ICS and I would like to know if I can unlock the booloader from ICS, or if I have to downgrade to gb before unlocking
If it is unlockable, yes.

[Q] check for unlocked bootloader

I have unlocked bootloader. After I upgrade to 4.4.4 by flashing a ftf file do my ZU is still unlocked? How do I check for unlock bootloader. Thanks for your answer!

Possible Downgrade?

I wanna use this tutorial to get a root with Locked Bootloader. http://forum.xda-developers.com/m4-aqua/development/root-xm4aqua-e2303-bolek-t3340399
This is only for 26.1.A.3.111 mine is right now on 26.3.A.1.33.
So my question is i can downgrade if yes how?

[SNAPDRAGON] Downgrading the Redmi Note 4

Hello everyone..
I recently got my Redmi Note 4 SD, its the 4/64GB variant and the device is classy I must say. However, since the last update, my device is having RAM issues and above all, heating issues. What I'm trying to know is can I flash the outdated version via fastboot method without unlocking the bootloader?
I am on the 8.1.15.0 version (Indian Variant) and I have the 8.1.10.0 version, I just want to rollback to it.
I hope there must be a way to flash stock ROMs without unlocking the bootloader. And also, if I unlock the bootloader and flash the stock ROM, will the bootloader get locked again or would stay unlocked?
A step by step guide would be highly appreciated.
ThankYou
Isn't there anyone who can help me out with this?
You need to unlock bootloader to downgrade or flash fastboot ROMs. You cannot downgrade from Updater app

SCH-i545 (I545VRSGPL1) Bootloader unlock or downgrade?

I own a Verizon Galaxy S4, and it has the PL1 firmware, I spent entire days searching to unlock the bootloader or downgrade to the android 4.4.2 firmware. I can't afford another phone for quite a while, and VoLTE is not supported, always in 3G. does anyone here has or know any way/ways to unlock the bootloader? I mean, the device was released in 2013, I quite sure there would be some methods to unlock the bootloader, right? Anyone? Please help?
Found anything yet?

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