Tutorial [Q] From PacRom 4.3 to android revolution HD v29.0 4.1.2

Hi guys

A week ago i decided to downgrade my SG3 From PacMan rom 4.3 to Android Revolution HD 29.0 4.1.2. First i flashed the stock rom 4.1.2 but the imei lost and the sn was changed to 0000... I restored the imei with my backup.Done……
Then i understood that i have to change the modem. I flashed xxemg4 patched modem and it worked fine. Now i have my phone running the stock rooted rom cause when i tried to put Android Revolution 29.0 All went unknown(imei,baseband and sn 00000...). I restored my imei and i was very hopeful because the only problem was the sn which was 00000000. I flashed the patched xxemg4 modem which i flashed in stock rom and worked fine but when i opened the phone all had turned into unkown imei,baseband,signal and sn 000000. Any ideas pleasse, i want the old fast and stable Android Revolution ROM with touchwiz interface

Thank you!