Root Modify system files, or app to tether.

[utny]

I have an bootloader unlocked, rooted, S-ON M8 (T-Mobile), the only thing I really care about is being able to tether.
I've tried the method: http://www.cultofandroid.com/61639/enable-free-wi-fi-tethering-htc-one-m8/
and the system files are just returned to their previous state after reboot.
(Similar problem when trying to use an ad blocker app, the changes to the hosts file won't stay)

People have suggested trying: https://play.google.com/store/apps/details?id=net.snclab.wifitetherrouter&hl=en

My main question is, if I get S-OFF can I do the first method? or will this app work so I don't need S-OFF?
or are there other methods you could tell me about?

I'd appreciate any help.

 

[EarlyMon]

Terminal Emulator, say -

su

(wait for root authentication by SuperSU, grant access)

From # prompt say -

mount -o rw,remount /system

Mind where the spaces are.

You can't change /system while it's read-only, its normal state - it has to be read-write.

The mount change won't be permanent but changes you make while it's read-write will be, so be sure to make a nandroid backup before modifying anything.


Wifi Tether Router won't need s-off, neither does anything else at the system level.

S-off is for more flexibility flashing low level firmware. It's not a panacea.

 

[utny]

That works! Thanks so much for the help, and the crazy fast response.

 

[EarlyMon]

You're welcome.

Do your hosts file while you're at it.