Unlocking Bootloader and Warranty - Redmi K20 / Xiaomi Mi 9T Questions & Answers

Hi! I would like to ask you what happens when you unlock the bootloader, and if the warranty would be voided.
I have asked in the Xiaomi support chat, and they have told me that unlocking it entails losing the warranty, even the simple fact of “using” the bootloader voids it (I can attach a capture of the conversation if you want, but it is in Spanish)
I don't trust what they told me, because I think that if you flash a official MIUI rom, and locking the bootloader again, would make impossible to discover that you unlocked it before. But they told me that....
What is your opinion?

If you relock the bootloader, you are safe.

Related

Rooting : Gingerbreak vs bootloader unlock + fastboot flash

What would be the difference between these 2 methods of rooting for XPERIA Arc?
I know Gingerbreak is much easier to do than the other one. But, is there any limitations to what Gingerbreak can do compared with the other method ?
Since bootloader is still in locked state, that means those who did it with Gingerbreak still have their warranty valid, right? What about the installation of future custom ROM ? Would the devices rooted with Gingerbreak have no chance to install custom ROM because the bootloader is locked ?
Sorry, I'm pretty much confused atm about rooting the Arc.
My understanding is unlocking the bootloader does not give you root. Even those with unlocked bootloaders must root using either ginger break or the other method.
Having the bootloader unlocked will allow for installing custom roms though, when recovery is sorted. Those of us with locked bootloaders will have to hope for a workaround at a later date.
As for warranties...who knows on this one. SE have allowed the unlocking of bootloaders saying it "may" void warranty. Theres nothing to say rooting will void it. Personally I think the only way you will void it is if you brick it whilst fiddling with it. I think any hardware issues will be sorted regardless. (but thats my opinion, dont take it as gospel)
Rooting is rooting, it doesn't really matter what the mechanics of it are, if it's successful then the outcome is the same.
As for the two methods, yes, GingerBreak seems to be the simplest so for most people there's really no reason not to do that. If it fails and you have a handset you can unlock the bootloader on, then you can always do it the other way if need be.
When it comes to custom ROMs, there's a good chance that having an unlocked bootloader will be a requirement, to begin with at least.
It's possible that someone will find a way to offer custom ROMs for locked bootloaders but it's just more work.
if the buutloader remains unlocked your phone can ALWAYS be repaired through seus, the bootloader needs to be unlocked for the phone to be bricked . also flashing of custom roms may not require the bootloader to be unlocked - as is the case with the x10. as far as i know though the bootloader needs to be unlocked to flash new kernals but there is a workaround that for the time being with the ability to flash the various basebands. my bootloader will remain locked for the timebeing - its a sure failsafe if anything goes wrong
Thanks for the replies everyone.
I had this concept of "If you don't root your phone, you can't install custom ROM" and "If your bootloader is locked, you can't install custom ROM" before I found this Gingerbreak rooting method. (i.e. boot loader unlock -> can root -> can install custom ROM)
But just before it was conflicting because with Gingerbreak root your phone, but it seemed to me that you can't install custom ROM because the bootloader is locked. However they said "If you root your phone you can install custom ROM".
So for this time being, taking out the question whether custom ROM (which no one yet to make it for Arc) can be installed, I think it's safe to say : "Gingerbreak rooting with busybox installed gives you the same capabilities to bootloader unlocking + fastboot flashing", right?
more or less......
x10 was never unlocked bootloader,how many custom ROM out there?
cheers
Sent from my LT15i using XDA Premium App
ArcOnFire said:
"Gingerbreak rooting with busybox installed gives you the same capabilities to bootloader unlocking + fastboot flashing", right?
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Not exactly. You can't flash custom .imgs via fastboot if you don't unlock the bootloader.
And I don't understand why people think that phone can be totally bricked if you unlock the bootloader...
sorry to say that,unlock bootloader seems waste of wait of time,if gingerbreak works
Sent from my LT15i using XDA Premium App
blagus said:
Not exactly. You can't flash custom .imgs via fastboot if you don't unlock the bootloader.
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Click to collapse
Well... yes, I already thrown that factor out when I asked my question.
But looking at the history, is there any case a custom ROM can be installed on a phone with bootloader still in locked state?
This is AFAIK
SE uses locked bootloaders for three reasons
1- A secure place to put DRM certificates.
2- A secure place to SIM lock the phone
3- A secure way to forbid modifying the software, as the bootloader will require a signed software in order for it to boot it ( If I'm not mistaken this is the problem with X10 unlockable bootloader as it's just hard to sign an image, correct me if I'm wrong ). the signed software thing is meant to be for not bringing bad software that may damage the phone
After SE saw that a lot of peoples want to install custom ROM's into their phones without too much hassle and a lot of them understand the risks of this so they decided to make it possible to unlock the bootloader but they want it to be the right way...
1- First the DRM certificates will be deleted as installing custom ROM's with exposed DRM certificates can bring serious legal problems to SE ( as this will mean the ability to save a digital unprotected copy of a DRM protected media )
2- SIM locked phones are excluded from this bootloader unlocking as this can make it easy to unlock the SIM lock so this will put SE in a bad position between operators..
3- As the main reason for unlocking the bootloader is installing custom ROM's and this is what the community want's SE made a bold statement here that doing so will violate the warranty as SE can't guarantee what a custom ROM may do to the phone...
but x10 has recovery
Sent from my LT15i using XDA App
The Arc isn't the X10.
Boring. This is a first time i use SE phone. I think this is also a last time. I will come back with HTC. There are no custom and no one with cook custom rom for SE device already
justbenice said:
Boring. This is a first time i use SE phone. I think this is also a last time. I will come back with HTC. There are no custom and no one with cook custom rom for SE device already
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Click to collapse
How many time passed from exit of ARC???
justbenice said:
Boring. This is a first time i use SE phone. I think this is also a last time. I will come back with HTC. There are no custom and no one with cook custom rom for SE device already
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Click to collapse
sorry ... I have from only 3 weeks the Arc and already have bootloader unlocked and Root ...
I think you're just a little patience
From what I gather, they can't refuse a warantee repair if it is a hardware fault, not caused by the unlocked software (as it is a problem with their manufacturing, and therefore their fault), but if you mess your phone up with something due to the unlocked bootloader they can (for example, you overheat your CPU with an overclock or something).
chriscpritchard said:
From what I gather, they can't refuse a warantee repair if it is a hardware fault, not caused by the unlocked software (as it is a problem with their manufacturing, and therefore their fault), but if you mess your phone up with something due to the unlocked bootloader they can (for example, you overheat your CPU with an overclock or something).
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That's what I heard too. As long as you didn't mess with you phone in some way, they can't prove that the hardware fault came from the modified software and should therefore repair your phone nonetheless. I guess that's why they say that unlocking the bootloader MAY void one's warranty.
have rooted thro' gingerbreak - but am am getting frequent random reboots. while calling or recieving. can anyone help me with this.

warranty and the bootloader?

If I were to unlock the bootloader, would I be unable to return my device if I chose to (within the return policy of course)? Is there a way to relock it?
specter491 said:
If I were to unlock the bootloader, would I be unable to return my device if I chose to (within the return policy of course)? Is there a way to relock it?
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No one here can give you a guarantee that the manufacturer will accept it but it works fine most of the time. You can re-lock with "fastboot oem lock" in the same way that you would fastboot oem unlock. Even further you can flash the factory stock image back to the device before locking it.
It is a Nexus device, unlocking itself does not void your warranty , by google's own statement .
Although if you flash non factory software, they have the option of not honoring the warranty.

[Q] Questions about rooting and warranty

I just got a nexus 7 and am thinking about rooting it. I know that unlocking the bootloader voids the warranty. If you flash a stock image and relock the bootloader after rooting, is there any difference from how the tablet was before rooting? Could I then send it in for a replacement, if it was within the warranty period and it had developed a hardware problem (which wasn't related to rooting)?
Is there any known problem with the nexus that might develop which would prevent me from relocking the bootloader (e.g. problems with the USB port?)
Is there any way to relock the bootloader without a computer?
Thanks and sorry for the nooby questions
If you flash a stock ROM with stock recovery and re-lock the bootloader you should be fine. I've heard that as long as you don't mess with the internal hardware, you should be fine sending back as is, but don't take that as gold because it's just something I've heard.
Not sure on the known problems to be honest. You should be able to use a phone or another tablet to lock your bootloader as long as you can get fastboot installed on it.

DP installation voiding warranty

I really want to install AW2 DP on my Huawei Watch as I find AW1 very laggy. However I am worried about the warning that it will void my warranty if I do so. Is this because it unlocks the boot loader? Can it be relocked should I need to revert back to AW1 and return back it for repairs etc?
tboy2000 said:
I really want to install AW2 DP on my Huawei Watch as I find AW1 very laggy. However I am worried about the warning that it will void my warranty if I do so. Is this because it unlocks the boot loader? Can it be relocked should I need to revert back to AW1 and return back it for repairs etc?
Click to expand...
Click to collapse
You can relock the bootloader fine but only if you're 100% stock unless could risk bricking the watch, Since Dev Previews are supported on HW warranty shouldn't be void
liam_davenport said:
You can relock the bootloader fine but only if you're 100% stock unless could risk bricking the watch, Since Dev Previews are supported on HW warranty shouldn't be void
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Click to collapse
When I attempt to unlock the bootloader with ADB, I get a warning on the watch saying unlocking the bootloader will void the warranty. I really want to try AW2 but I don't want to void the warranty.
If I proceed to unlock it and want to flash stock AW1 back on it at a later date, can I relock the bootloader so no one would ever know?

Root oneplus 5 without unlocking boot loader ... Any one Help.

Hi friends,
Can anyone tell me is it possible to root oneplus 5 without unlocking the boot loader?
thanks
I never tried this myself. But you can try this.
https://gist.github.com/aldur/b785257ac26d23bce648cad3ce2f6dc8
Looks like it involves ADB after every bootup.
Can I ask why you want / need to.
OnePlus are very good about not caring I'd bootloader is unlocked for warranty purposes and after a year the warranty doesn't matter anyway so what's the risk? You can always relock the bootloader later?
No point in not unlocking the bootloader, 1+ doesn't care about it.

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