Help, i337m won't stay locked to WIND

Hello, ive acquired a Rogers s4 i337m that has been sim unlocked and rooted, and possibly aws enabled. It has worked for about two months on Wind with no issues and all of a sudden it started dropping signal and lock into roaming mode.

I've done many firmware upgrade and downgrades, flashed custom ROMs and different modems. Formatted the /system, data, cache, dalvik.

On a fresh install it looks like it works. Until I put the phone away. After about 30min to an hr the phone automatically switches to Roaming and I don't even have an option to select Wind as a network provider.

Anyone with similar issues could please xhime in?

Just switched to 4.4.2 bootloader and modem (NC1), with Kangapop Rom

SGH i337M suddenly doesn't read SIM and has no popups.

So I recently sold my SGH i337m and the customer has been messaging me telling me that absolutely nothing happens when he inserts his SIM card. No popup saying no sim detected, nothing. When he goes to settings > more networks > mobile networks there's a pop-up that asks him to "insert sim card", and that's about it.

I know for a fact I sold him the phone WORKING as I made sure multiple times to test the phone with my SIM card and everything worked before I sold it to him.

I've been troubleshooting with him but unfortunately I have not come to a solution yet.

Things I have tried:

1. Remove battery & SIM then put back in


2. Reboot in safe mode


3. Wipe cache in recovery mode menu


4. Wipe data/factory reset in recovery mode menu


5. Insert another person's SIM (still no pop up, even when he uses a SIM from a locked company, it doesn't even ask for the unlock pin)

I'm hoping some of you guys have a solution because I've been looking all over the internet and no solutions have worked thus far.

Thanks in advance!

Any 5.1.1 Roms for i337m that are stable

Just wondering what's out there for this device.. Thanks