Of course, Sprint does have the authority to cut off one's service for rooting (or for any other thing they see fit).
Has nothing to do with Android ROM version. It has to do with your bootloader version. If your phone came with EK02 or EL29, jig will not reset stats, but will get you to ODIN download mode. You'll need to flash EG30/31 bootloader to restore functionality. Look in the wiki if you need it.
After further investigation, it looks like I can't find a fully legal and safe way to root.
I thought that installing an insecure kernel would do the job. But unfortunately the initramfs inside the zImage includes, in addition to the GPL Linux kernel itself, Samsung-copyrighted non-GPL code, such as redbend_ua, various Samsung-copyrighted image files and customized .rc scripts. So it looks like I can't legally download an insecure kernel.
I could build one myself, copying the files that will go into initramfs from my phone, and modifying to make it insecure.
But the problem is that this is unsafe, as I will have no way of restoring the stock kernel if I screw up in building the kernel, since there does not appear to be any legally available download of the stock kernel anywhere. (Check FUS doesn't seem capable of downloading EL29, but in any case in the US there are legal issues--DMCA--with Check FUS's decryption.) And without root, I cannot simply dump the kernel from the device using dd--if I could, that would solve the problem.
So, here's my question: Does anyone know any legal way of restoring the stock EL29 kernel (i.e., without downloading the stock firmware from an unauthorized location)?
This is really frustrating. I am not a lawyer, but it looks like one needs to be one to figure out how to root a device properly. Of course, I expect people think I am nitpicking. (But then again, I am a professional nitpicker in my day job.)
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