[Q] Is it possible to change the modem in my Z3? - Xperia Z3 Q&A, Help & Troubleshooting

I'm in Australia and have a 6653 Z3 running a pre-rooted stock 5.0.2 firmware. i want to know if it is possible to flash a new modem and if so how?
Thanks

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[Q] No Signal Sony Xperia J

I flash stock rom from http://forum.xda-developers.com/xperia-j-e/general/xperia-jst26i-roms-kernels-mods-how-tos-t2237164
it's stock rom ics http://d-h.st/lP5
i wonder if it's the cause that my device no signal
how to check i have the correct baseband or something, i live in indonesia and that stock rom show international generic
is it compatible?
i wonder if its because not compatible stock rom or my device signal is broken , help

[Q] Downgrade from Brazil Lollipop update.

My device is XT1033 Asian Version
Recently i Flashed Brazillian Kitkat version 4.4.4 then installed Lollipop Brazillian ota update.
So my phone works fine on Lollipop.
Now, im thinking of using custom rom for Lollipop.
I understand that i need to be on XT1032 Kitkat 4.4.2 to be able to flash those roms.
I noticed that many people bricked their device by downgrading.
Just want to be sure, should i re-flash Asian Kitkat 4.4.4 Stock , then flash xt1032 4.4.2 followed by required rom?
How is the process like. I just want to know if there is a way to downgrade successfully without bricking the device ?
thanks.

Downgrade from lp to kk?

Hey all I'm looking for some advice/pointers. My z3 was on three UK kk, I left bootloader locked, flashed a kk fw, rooted and then updated to lollipop. To be honest I'm not liking lollipop so was wondering
A, whats the difference between generic and global fw's
B, can I downgrade to a kk fw without any issues?
C, can anyone tell me what the last kk fw was please and if there is a prerooted version?
Many thanks
Paul
Sent from my D6603 using Tapatalk

req for stock 5.1 D6603 UK rom

After the rom described but an unrooted ftf file if possible?

[D2302] Latest India Generic Stock Rom {Fresh} [18.6.A.0.182]

HELLO GUYs,
This Rom is for only Xperia M2 Dual (D2302) Model Phone.
Android Version - lollipop 5.1.1
Rom Version - 18.6.A.0.182
Customize - India Generic
This Rom is Full Fresh
Download Link MEGA - goo.gl/EA8LtK
IF YOU HELPED PLEASE PREASS THANK
Hi there! This might not be the right thread to ask, but I wanted to know if there's Stock ROM for D2303 without bloatware?
I know the Z5 Style and EagleXperience, but a stock one without features and without bloatware?

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