Is there a way that i can update my OS

[mabf000]

Hello all, i'm trying to update my OS but im S-on
my bootloader is unlocked, my rom is rooted and have the twrp

this are my htc one a9 specs

 

[eavandijk83]

Hello all, i'm trying to update my OS but im S-on
my bootloader is unlocked, my rom is rooted and have the twrp

this are my htc one a9 specs

There is a lot to find about updating your OS here on XDA. The latest ROM can be found on lineageos.org.

Basically:
1st time

1. Unlock bootloader
2. Install latest TWRP
3. Wipe Data, System, Cache, Dalvik Cache partitions from withing TWRP
4. Flash latest ROM from within TWRP
5. Flash latest GApps package from within TWRP
6. Flash latest SuperSU or Magisk (I prefer SuperSU) from within TWRP

Before I forget... make sure you've got the proper Nougat RUU installed! More info can be found here.

 

[Wonders_Never_Cease]

Since you are currently using a branded ATT device,and are S-On... No you cannot upgrade beyond current version. If you were to S-Off and convert device to Dev/Unlocked version,you could then upgrade to latest build available.

Hello all, i'm trying to update my OS but im S-on
my bootloader is unlocked, my rom is rooted and have the twrp

this are my htc one a9 specs