Why switch modem if you think it's an issue with ROM?
Prerequisites to CM say nothing which modem you must have or that any of them are not good. CM don't change either bootloader, GSM or LTE modem.
CM provide RIL to communicate with modems.
QualComm based CM hasn't been able to manually search carrier since Aug 2014 https://jira.cyanogenmod.org/browse/CYAN-4902 and perhaps the decision to de-unify S4 CM can resolve this for Lollipop within a time frame of 3 months.
Please inform if you can find any chance log of what's fixed for different modem versions.
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As I've said, this issue is also present when I was still on touchwiz/stock rom. And as you said, CM doesn't change the modem so the issue might be with the modem itself so I'm planning on upgrading to the latest one. Problem is, I don't know how to.
Just to be clear, I'm on EDGE most of the time on Network A on both CM12 and stock touchwiz rom. On Network B, I normally get HSPA+.
You should use the modem based on the country that you are using the phone as the bands available in each country and those included in the modem differ else you may have network issues, for more info refer to this post
Based from this, I need the modem that works with 1800/2500/2600 bands. I'm currently on NF1 and I have no clue which other modem works with the said bands. Help please?
Thank you! One question though, should I flash NI1_AUT_wifi_150107.zip as well? I'm not sure if that only applies if I'm on the WizCyan rom.
Just in case something wrong happens, if I go back to the stock rom using odin, will it revert back to the original modem?
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