I currently have the stock rom for Australia XWLSH (unbranded) on my phone. It's rooted using PhilZ kernel. I've very happy with it as it is but would like the multi-window function while still staying with a totally stock ROM. The only way to do that is to use a stock deodexed ROM and the only one of those around here is the XXLSJ which is a european stock S2 ROM.
I can easily extract the modem.bin file from my backup image I got from sammobile but I was hoping I might be able to just flash the XXLSJ deodexed ROM and all would be fine (It is prerooted with PhilZ kernel).
from the little I have read about modem flashing so far suggests i might have to also flash a matching ril which further complicates things.
My USB port works fine, connects to my PC fine, i just prefer flashing to using Odin from my PC.