International S4A LTE: which Samsung firmware can be flashed safely?
I have a rooted international s4a lte with I9295XXUAMF5. As I have some problems with latency on edge, I was wondering, if I could "simply" upgrade to, say, MF7.
1) Do I need the right version for my provider? (Vodafone Germany, "DBT") or can I download any MF7?
2) Which versions are safe to upgrade without getting KNOXed?
3) I read in some custom rom-threads that special modems need to be flashed. Can I flash some other modem over my MF5 or are these modem files so special that they only work with some special roms?
Thanks for your help and patience (coming from a galaxy nexus and things are a little more complicated now...)