Just in case it helps others. First let me tell you: My bootloader is locked and I am not rooted. Ok, After playing a bit with MM i thought lets upgrade to N. So I flashed S233 "update".zip via stock recovery. Tried N for couple of days and did'nt like it (personal preference). N is a bit faster and smoother than MM. Only thing i liked was actual Night mode. Anyways. long story short, here is how i downgraded to MM and got my Network signal back(after losing it 
)
1. Things we need Minimal ADB, Lenovo drivers,and of course ROM S048 zip.
2. I extracted Minimal ADB and the rom in the same folder on pc.
3. Connected my phone to pc and booted in bootlader mode( by pressing volume down and power button together).
4.Opened a command prompt(CP) in the same folder of Minimal ADB and in the CP i wrote fastboot(SPACE)devices. It showed my P2 serial number.
5. Then minimizing the CP i went back to the ADB folder and double clicked " Flash" batch file. Waited for around 10 mints and and done.
6. Rebooted and after initialization screen everything was ok but there was no SIM signal. Did the whole flashing process again, but same result.Took out the SIM and connected to WIFI.
7. Got a system update notification(S062). Did the update ,reboot but still no signal(inserted the SIM again). Turned off and reboot got signal back on 2nd SIM only. Again reboot got signal on both SIMs, but could not make any call from SIM one.
8. Here I really got scared but still did not want to try those "erase modem" commands. So, went to recovery full wipe and format. Rebooted and got everything back.
Note: there is no TL;DR version. cause most of the times we learn the hard way.
)1. Things we need Minimal ADB, Lenovo drivers,and of course ROM S048 zip.
2. I extracted Minimal ADB and the rom in the same folder on pc.
3. Connected my phone to pc and booted in bootlader mode( by pressing volume down and power button together).
4.Opened a command prompt(CP) in the same folder of Minimal ADB and in the CP i wrote fastboot(SPACE)devices. It showed my P2 serial number.
5. Then minimizing the CP i went back to the ADB folder and double clicked " Flash" batch file. Waited for around 10 mints and and done.
6. Rebooted and after initialization screen everything was ok but there was no SIM signal. Did the whole flashing process again, but same result.Took out the SIM and connected to WIFI.
7. Got a system update notification(S062). Did the update ,reboot but still no signal(inserted the SIM again). Turned off and reboot got signal back on 2nd SIM only. Again reboot got signal on both SIMs, but could not make any call from SIM one.
8. Here I really got scared but still did not want to try those "erase modem" commands. So, went to recovery full wipe and format. Rebooted and got everything back.
Note: there is no TL;DR version. cause most of the times we learn the hard way.
