What is S-OFF

Recently the next door began to maliciously hurt the machines of friends who had bought S-OFF. I can't stand it anymore. Post out a description.
What is S-OFF?

S stands for security lock. S-OFF is the protection off. S-ON is to protect open

Secure lock is a security lock. It is a security lock designed for commercial use to protect your firmware from being flushed. If the security lock is disabled, the flash chip's write protection will be disabled. The implication is that the ROM can be flushed at will.
And S-ON is the security lock opened. Mobile phone write protection. When the HTC machine uses ruu to brush the machine, ruu will temporarily disable the security lock. Then you can use HTC's Rom. HTC hboot also has signature verification. Therefore, Rom without the HTC signature cannot be verified when it is flushed.

So what is Eng S-OFF?
Eng engineer. Is the meaning of the project. It is the SPL used by HTC mobile phones during engineering testing. This SPL is the most unstable. Generally, this SPL is only contained in HTC's Eng version ruu. This is included in the project version ruu.

What is ship S-OFF?
Ship refers to shippment, which means publishing and sending. When HTC delivers to major carriers, the Rom is a ship S-ON. These Rom are all tested and stable. It is also the system used in the retail version.

Which S-OFF is better?
First, let's talk about the difference between the two types of off. Eng S-OFF is a separate SPL-Level off this engineering version of SPL is used for developers to debug so the fastboot debugging function is enabled. That is, you can run the fastboot command to fl the image.
The ship S-OFF is based on the retail version (released version) SPL with HTC internal unlock tool to unlock. S-off. This S-OFF did not enable fastboot function, relatively stable, after many tests, hardware compatibility is also better, there will be no bad signal, WiFi disconnection and other problems. Another best benefit is that any version of htc rom and official ruu can be directly refreshed. After the official website is refreshed, it is still S-off. Like Eng SPL, the official ruu will be refreshed and the S-off will be restored. You can also swipe the ROM card.
Therefore, the quality must be measured by the user.

What is alpharev?

Alpharev is a foreign expert disassemble htc spl and then modified into a S-OFF. Many people set the screen to the first screen. Is the SPL modified by a third party. Compared with the above two official SPL, he also enabled the fastboot permission for Eng SPL.
More unstable and more risky.

Make a wise choice.

That's all I can tell you. More often, HTC will bother me. Do you know why I have so many starters? Why are so many global startups? Why is the Security Intelligence Network maliciously hurt? One aspect is of course the need for their hype. One aspect is the red eye. I didn't go to where to release the Rom. Haha ......

Ship S-OFF students can brush their own corresponding models of ruu can test their own. Eng S-OFF's students are not afraid of downgrading can also brush casually. If you are stupid, I can't help you use G6 ruu to brush G7 mobile phones. Don't blame me for not reminding you.


The original text on xda wiki:
Finally, what's radio S-OFF and what does it mean to me? Finally, what is wireless S-OFF? What does it mean to us?

The "S" stands for "security ".

S indicates Security

As scotty2 says ,"S-off is the switch that says 'Alright, do whatever you want to do-good luck!"

As scotty2 said: "s-off is a switch that says" Okay, do what you like-good luck"

So here's how it works-normally when you boot up, hboot (the bootloader) says to the radio, "are you S-ON or S-OFF? "If the radio says" S-ON "then the bootloader will prevent you from using most of its commands, and will write protect system and recovery. if the radio says "S-OFF", then it will not prevent you from using most of its commands, and it will not write protect system and recovery.

The following figure shows how it works. Generally, when a mobile phone is started, hboot (bootloader is often called Spl) says to the wireless baseband (radio): "baseband, are you a S-ON or a S-OFF? ". The wireless baseband (radio) will detect its own mark, if the baseband returns a S-ON, then hboot will prevent you from using most of the commands it (hboot) carries, in addition, the system partition and recovery partition are written for protection. If the wireless baseband returns the "S-OFF", then you can use the hboot with many commands. In addition, the system and rediscovery partitions are not protected by writing.

Even phones that have been "permarooted" still have an S-ON radio.

Even if the phone is "permanent root", Radio still S-ON.

But-You say, system and recovery haven'tbeen protected since scotty2 figured out how to defeat the emmc protection... that's what permaroot is all about, isn' t it ?! So surely the radio must already be S-OFF!

However, you will say that since scotty2 finds a method to overcome emmc write protection, the system partition and recovery partition are not protected by writing... Isn't that permanent root? So wireless baseband should be a S-OFF?

Nope. You 've had "label" S-OFF. Not radio S-OFF.

No !, You just have a S-OFF tag and your radio is not s-off.

As scotty2 puts it ,"[By patching hboot], we forge [messages to hboot] So it always looks like the radio says it's S-OFF."This works great so long as you 've got a hacked hboot. but here's the problem -- people have been getting into trouble by flashing factory firmware over their rooted firmware. first thing it does before writing the Rom is overwrite their patched hboot. hboot turns on read-only mode on the recovery and/system, and the poor folks get locked out of their phones with the old firmware still there.

As scotty2 explains, "by patching hboot, we force a message to hboot to tell hboot that radio returns S-off. "This method works very well, so what you get is a modified hboot. Then the problem arises-when people flushed the official firmware provided by HTC on the Root firmware. The first thing to brush the official firmware is to use the hboot that comes with the firmware to fl hboot that has been patched on the mobile phone. Hboot enables the read-only mode of the system and recovery partitions. Poor child, the machine is locked.

Having "real" Radio S-OFF, scotty2 says, "will save people from almost-bricking-by-way-of-reflashing-factory-firmware. "It also means you'll have unrestricted access to messing with your phone's radio. although-he notes, the android kernel itself restricts your access to the radio partition. for your safety.

With a real baseband S-OFF, scooty2 said, "It will save those who have changed their official firmware." It also means that you will have unlimited permissions to drum up your mobile phone's radio. Although-he said that the andorid's kernel will prevent you from accessing the wireless partition.