Hi Everyone!
I'm in great trouble so I decided to post my problem here. If it doesn't belong to here please help me where to post and instantly get answers.
I've a beautiful Samsung Galaxy S4 Mini SGH-I257 AT&T smartphone without any issues. It is running on android 4.4.2. As we all know Cynogenmod has end its development and the successor is LineageOS.
From a long time I was searching for at least a lollipop update for my smartphone on-the-air but AT&T didn't release any lollipop update to SGH-I257. When I was searching for the lollipop update, I found LineageOS providing official custom ROM updating my android to 7.0 Nought.
For this I rooted and tried to install TWRP Recovery but it was not successful. When I rebooted into recovery there was a message "Software installed is unauthorised please contact your nearby AT&T Store." and then I came to know it have a locked bootloader but I'm not sure about this. And one thing to mention I flash TWRP Recovery using universal method by installing the app.
Now please help me how I can unlock bootloader if it is locked?
How I can flash TWRP Recovery using any other method?
Thankyou.
I'm in great trouble so I decided to post my problem here. If it doesn't belong to here please help me where to post and instantly get answers.
I've a beautiful Samsung Galaxy S4 Mini SGH-I257 AT&T smartphone without any issues. It is running on android 4.4.2. As we all know Cynogenmod has end its development and the successor is LineageOS.
From a long time I was searching for at least a lollipop update for my smartphone on-the-air but AT&T didn't release any lollipop update to SGH-I257. When I was searching for the lollipop update, I found LineageOS providing official custom ROM updating my android to 7.0 Nought.
For this I rooted and tried to install TWRP Recovery but it was not successful. When I rebooted into recovery there was a message "Software installed is unauthorised please contact your nearby AT&T Store." and then I came to know it have a locked bootloader but I'm not sure about this. And one thing to mention I flash TWRP Recovery using universal method by installing the app.
Now please help me how I can unlock bootloader if it is locked?
How I can flash TWRP Recovery using any other method?
Thankyou.
