Install unsigned boot.img

[flipreverse]

Hi!

Since I want to continue developing my SystemTap4Android project, I have to build my own kernel which includes debug infos.
I’m capable of building, creating, and flashing a boot.img. However, I figured out FP Open uses a signed boot.img.
Thus, I must sign my own boot.img as well or disable the check.

Does someone know how do I either disable the check or sign my boot.img using the right key?
On my opinion, the latter might be complicated, because the FP crew probably won’t release the key they used.

Cheers,
Alex

[AnotherElk]

Here’s how to sign TWRP images for booting them via fastboot without flashing them.
I don’t know whether it would be the same for your boot.img, but you could have a try …

Linux/ macOS

TWRP 3.1.1-1 boot issue

For reference: I have a guide on my blog which should work on Linux/macOS: https://z3ntu.github.io/2017/06/16/Signing-boot-images.html

Windows

TWRP 3.1.1-1 boot issue

I looked into this on Windows and got me a signed current TWRP image that fastboot boots on my phone (yes, I’m surprised myself). Here goes … and you don’t have to bother with the whole key stuff, we’ll just download some … Install Java (if not already installed). Make (or look for) a directory to put stuff into. Download BootSignature.jar from @z3ntu’s place to the directory (URL found here). Download SignApk.zip (found here), from SignApk.zip extract the two files testkey.pk8 and tes…