In the past, HTC did not provide official unlocks. Perhaps due to greater market pressure, it has only recently provided official unlocks. It should be noted that the official unlocking does not open all HBOOT permissions, but only opens some fastboot permissions with restrictions. For example, RADIO permissions are not opened.

Furthermore, you cannot use card swiping to flash recovery, boot, etc., you can only swipe online (fastboot command). After the official release, LOCKED becomes UNLOCKED, but HBOOT is still S-ON and loses the official warranty. After re-locking, UNLOCKED becomes RELOCKED instead of reverting to LOCKED.

The S in S-ON and S-OFF stands for Security Lock, which means protection lock. S-OFF is the protection switch. Secure Lock is a security lock. It is a security lock designed by hardware designers to protect their firmware from being rewritten. If the security lock is turned off, the flash protection for the flash memory chip in the phone is turned off. The implication is that you can flash the ROM at will.

S-ON means the safety lock is turned on. The phone is write protected. When using RUU to flash HTC machines, RUU will temporarily turn off the security lock. Then you can flash HTC's own ROM. HTC’s HBOOT also has signature verification. Therefore, ROMs without HTC signatures cannot pass verification when flashing.

S-Off is a validation value of the HBoot part of the ROM, so if you want to turn on S-Off, you need to flash a specially modulated Hboot file into the ROM area of ??your phone. Compared with official unlocking, S-OFF has all HBOOT permissions. Of course, flashing is convenient.

No.

Unlock it first, and then ROOT (obtain the highest permissions) to delete your system files or system software