What is S-OFF?
S-OFF stands for Security-OFF
S-OFF means that the NAND portion of the device is unlocked and can be written to. The default setting for HTC’s devices is S-ON, which means that neither can you access certain areas of the system nor can you guarantee a permanent root. Furthermore, signature check for firmware images is also ensured by the S-ON flag.
What has already been done?
-Tried flashing DIAG file, but with no success. File needs SuperCID.
-Tried flashing ENG HBOOT as zip file, but with no success. File needs SuperCID.
-Tried flashing modified DIAG file, but with no success. File needs SuperCID.
-Tried flashing modified HBOOT as zip file, but with no success. Signature check failed.
-Tried creating a Goldcard, but won't work. The Goldcare is for Qualcomm devices.
-Root while phone is LOCKED, won't work. Only will work on the Qualcomm One X and One XL.
-Ask the Chineese guy with the S-OFF tool. Won't share, cause he needs his money.
-Tried flashing files over recovery, but with no success.
-Tried flashing TETS and MFG ROMs, but with no success. Phone needs S-OFF because the ROMS are not sighned.
-Tried changing CID, but won't work. Only will work on the Qualcomm One X and One XL.
-Tried commands over ADB, but with no success.
-Tried XTC clip, won't work.
How Do I Know If My Device Is S-ON Or S-OFF?
That is easy to verify. Simply boot into HBOOT (bootloader) on your device, and the text on top will show the flag status as either S-OFF or S-ON. A full root generally means S-OFF.
S-OFF – What And Why?
HTC have installed a sort of security check whose level is determined by S-OFF/S-ON. Essentially, this security level is a flag stored on the device’s radio that checks signature images for any firmware before it is allowed to be written to system memory. This hinders using any custom ROMs, splash images, recovery etc., and also restricts access to the NAND flash memory. However, when security level is set to S-OFF, the signature check is bypassed, allowing a user to upload custom firmware images, unsigned boot, recovery, splash and HBOOT images, as well as official firmware that has been modified, this enabling maximum customization of your HTC Android device.
Furthermore, S-OFF also reduces restrictions on accessing the NAND flash memory on the device, allowing all partitions (including /system) to be mounted in write mode while the operating system is booted.
Where is it located?
Don't know yet, here
are the partitions.
How can I flash through SD?
Tutorial added here
What HBOOT status have we seen so far?
ENDEAVORU PVT SHIP S-ON RL
ENDEAVORU PVT SHIP S-OFF RL
ENDEAVORU PVT ENG S-OFF RL
ENDEAVORU XE ENG S-OFF RH
ENDEAVORU PVT MFG RH
ENDEAVORU XE SHIP S-OFF RH
ENDEAVORU UNKNOWN ENG S-OFF RH
Partition list for One X with all addresses and lengths of partitions
share the full list which can be found here
How does HTC do it?
They do it with a smartcard/javacard/goldcard (What ever you want to call it) in combination with the DIAG file. Proof is in the attachment.