Author Topic: What is S-OFF ? Please read and try to understand !  (Read 1000 times)

kanniappan

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What is S-OFF ? Please read and try to understand !
« on: March 11, 2013, 09:53:39 AM »
What is S-OFF ? Please read and try to understand !      
What is S-OFF?
 
after doing your phone S-OFF, you do set follow functions on factory settings
 
- sim lock
- hboot lock ( this is the bootloader lock, you will be able flash cooked rom after this)
- cid lock (region lock so you can't flash it with other roms, unbrand it, or downgrade it)
- user lock (will be set to factory default)
- pattern lock (will be set to factory default)
- phone usage counter (helps you refurbish the phone)
 
 
  Temproot and Permaroot
- What's the difference?
First, let me explain root access. Root access, superuser or su (all the  same thing) is basically an admin account for Linux. It gives us  permission to to access commands that normally couldn't be accessed, and  to write information to partitions that normally couldn't be written  to. On older devices (such as the Hero), once we had root we could write  to the /system and /recovery partitions, and flash custom ROMs. In the  case of the IS (and every HTC device since the desire), this isn't true.  Getting root access is quite trivial and no where near as useful,  because the internal flash memory (NAND or eMMC) is locked down and it  means we everything we 'write' to the system (or any other protected  partition) is lost on reboot because it is a non permanent change. In  short, this stops us from flashing custom ROMs and recovery. This is a  problem for any devices that are shipped with the Security flag on  (S-ON). To get Permaroot, and the ability to flash custom ROMs, we need  S-OFF.
 
  So what's this S-OFF then?
Making the phone S-OFF with XTC clip, means also that you reset the  simlock, userlock and CID to factory state !!! Mean, your phone is100%  UNLOCKED
Since the Desire, HTC have been securing their phones better than before  by locking the internal flash memory (NAND or eMMC) to stop it being  written to, unless the file being flashed is signed by a private key  only known to HTC. This is controlled by a flag (@secuflag) and is  identified as the device being S-ON. Telling the HBoot the device is  Security Off (S-OFF) stops this check for the key, and allows us to  write anything to any partition, which is what we are aiming for.
 
There are actually two levels of S-OFF. The Bootloader (HBoot) and the  Radio. Getting S-Off on the HBoot gives us everything we need, but  doesn't actually turn off the @secuflag which is set in the radio. What  it is possible to do is to flash a HBoot that believes the Radio is set  to S-OFF, as the HBoot is responsible for setting that flag. Once the  HBoot on the phone is S-OFF, we can write to all the partitions and  basically do whatever we want, but it is possible to go one step  further. Flashing a radio that is S-OFF and actually setting the  @secuflag off gives 100% total access to every part of the phone and  it's software, as it becomes network unlocked allowing to you to use any  SIM and also allows you to flash a ROM from any carrier (known as Super  CID). It also makes it nigh on impossible to permanently loose root no  matter what you flash. Once you have radio S-OFF, it makes it much  easier to flash new HBoots and ROMs even if you flash something that is  locked down tight.
Setting the Radio to S-Off is not necessary, and gaining S-OFF on the  HBoot is more than most people will ever need. Radio S-Off is just the  last step of the puzzle, but it is worth noting the only points you can  permanently brick your phone is flashing a radio or a HBoot, if either  of these go wrong you will end up with a shiny expensive paper weight so  there is risk involved.
 
  What about this XTC Clip, can that help?
The XTC clip is a hardware device that can unlock S-OFF HTC phones, regardless of the software.
 
  S-OFF created by XTC Clip is temporary or permanent?
You can flash your phone as many times you want, your HTC will remain
  S-OFF forever, it is a permanent S-OFF !!!
What about people who are getting devices shipped with S-OFF? There are  reports that a lot of devices coming out of China and India are shipping  with the @secuflag set off. These are lucky people, and have the  ability to write to the flash memory, but it can't help those of us who  are S-ON. It is also worth noting that because most devices are S-ON, no  one has written any ROMs or kernels for the device so they will  probably have to wait until we get a way of turning our devices to S-OFF  until anyone creates any software for it.
 
 
 
++++++++++++++++Glossary+++++++++++++++++
 

  Bootloader a.k.a HBoot
- This is the piece of software that runs before anything else on the  phone. It basically packages it all up, tells what to run in what order  e.t.c Every computer device has a bootloader in some form or another, be  it an Android Phone, iPhone, Windows PC, iMac e.t.c. The HBoot is  accessible by switching your phone off, then holding down volume down as  you turn it back on. The first line of the HBoot will tell you if you  are S-OFF or S-ON.
 
  Recovery
- The recovery is the piece of software that allows us to write files to  partitions while they aren't being used. It is the portal to allow us  to flash custom ROM's and kernels. There are custom recoveries with more  options than the stock such as ClockworkMod.
 
Superuser a.k.a su or Root

- This is a user that is present on all linux distros that allows higher  permissions than standard users have access to. Certain apps need  superuser permissions to function, such as Titanium Backup.
 
PS: parts of this FAQ are "taken" from l0st.prophet @ www.xda-developers.com, 10x
 
 Regards,
GsmEasy
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What is S-OFF ? Please read and try to understand !
« on: March 11, 2013, 09:53:39 AM »

 

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