If i flash stock rom with odin, i lose twrp right?

I flashed twrp 2860 onto my jp softbank s6 edge sm925Z. 5.0.2 android.
I want to remove this bloatware trash.

Is there a way for me to backyp my current firmware
And then try another countrys firmware with odin, from the samsung
Firmware page?

Samsung does not release the jp softbank sm925z firmware.

So my question is, . . .
If i flash chinese firmware i will lose TWRP right?
Then i can not return to my backup stock rom. Because no twrp.

So i would need to hope i can reinstall twrp on the chinese rom right?

If i try other firmwares, i will lose wifi and cellular service right?

Is there a way for me to change or insert my wifi cellular partition information
To new roms or firmwares?

CAF Data Issues/wifi disconnect - lose LTE FIX -

Tired of LTE/data disconnecting on VS980 or other G2 CAF builds when disconnecting from wifi or when the phone reboots or other??

I may have a fix for you..

Install Tasker
Install Secure Settings and install the system+ option. Open tasker and create new task
- Name task LTEtoggle
step 1 : Click + then type wait in the seach bar and select wait then select 1 second hit back
step 2 - Click + and select plugin then select secure settings
- Select Custom Rom Action and select LTE
- Select toggle and hit save icon in the upper right
-make sure to select continue task after error and hit the back button
REPEAT STEP ONE
REPEAT STEP 2 - WITH THE EXCEPTION - Instead of selecting toggle, select ON and hit save.
-hit back
- Select Profiles and click the + at the bottom and select state.
- type wifi and select wifi connected then hit back button
-Menu will pop up, select LTEtoggle you just made.
Long press the LTEtoggle icon with the little green arrow then select EXIT task
-Select LTEtoggle again.
-Long press on the TOP GREEN LTEToggle and select unlink task.
-Make sure the switch is on, exit in the upper right and save when prompted.
Open tasker again and make sure its enabled in the upper left and corner by long pressing the wheel.

- You will get an error from toast saying LTEtoggle failed but ignore it or disable.

There is your LTE toggle when disconnecting from wifi. Works pretty well so far...

You can create another profile and select DEVICE boot and add the LTE toggle to it. And you will have an LTE auto switch for when your phone reboots or other..