How to do root without TWRP?


I don't understand you? Root detection has nothing to do with Play Intigrity. If that's what you're referring to. KSU isn't detected by any app today, not like Masgisk.
Sorry my english is Not good ...

I mean can i ROOT with KSU

In KSU App patch the init.boot.img

And then flash the Patched IMG with Fastboot?
 
Sorry my english is Not good ...

I mean can i ROOT with KSU

In KSU App patch the init.boot.img

And then flash the Patched IMG with Fastboot?
Yes of course.Get the init_boot.img from your ROM. Patch it with KSU, then flash it from your PC.
The commands:
fastboot flash init_boot_a (drag patched init_boot file)
fastboot flash init_boot_b (drag patched init_boot file)
 
Sorry my english is Not good ...

I mean can i ROOT with KSU

In KSU App patch the init.boot.img

And then flash the Patched IMG with Fastboot?
But that's only root with KSU. If you want susfs to be able to hide it completely, you'll need to either compile your own kernel or use the wild+ kernel, which has a kernel for almost all GKI devices It's crazy what that man does
 
Yes of course.Get the init_boot.img from your ROM. Patch it with KSU, then flash it from your PC.
The commands:
fastboot flash init_boot_a (drag patched init_boot file)
fastboot flash init_boot_b (drag patched init_boot file)
Partion a and b ? Both OK

How i compile i anown kernel ? LKM Mode or better GKI ?

Can you write me in WA ?
 
But that's only root with KSU. If you want susfs to be able to hide it completely, you'll need to either compile your own kernel or use the wild+ kernel, which has a kernel for almost all GKI devices It's crazy what that man does
I must Patched the init.boot.img .....Not the boot.img ? That is right or
 
To make sure both a and b are flashed. If you don't, system may boot from non flashed partition and you won't be rooted untill system uses other again.
OK i understand ,but what make i do to become the SUFS into KSU ?

I read i must compile a own kernel ,by the kernel Section i have many Kernels with Version 6.66

What i must choose and what must i do after i choose ?
 
OK i understand ,but what make i do to become the SUFS into KSU ?

I read i must compile a own kernel ,by the kernel Section i have many Kernels with Version 6.66

What i must choose and what must i do after i choose ?
You're clearly not going to know how to compile your own kernel. I already told you to use the wild+ kernel. The instructions are linked to GitHub itself. Read the thread, even the user xonline already indicated how to do it.
 
Kernelsu + susfs is the best on the Xiaomi 15. Having the GKI kernel allows you to completely hide everything. But it is more complex to install than Magisk. If you don't even know how to install Magisk without TWRP, it is complicated.
What have you Install for the strong Integrity ?shamiko ,TrickyStore or ?