Hi justin, I followed the instructions to
1. install service firmware 1.05na.
2. Reset to factory settings,
3. 1.05 is working fine on my 70mai pro now.
Guys, good news!
All is not lost. I got the SN error after upgrading to Korean guy's firmware. His firmware did not upgrade my CN set to US set successfully... but it did managed to change my SN from "CN" to "US". All I did was the use the emergency aid firmware from US XiaoYi site.
Gotten a 5.5v 4F Coin capacitor, but it does not seems to work... It is not charging...
Capacitors I bought: http://www.ebay.com/itm/351364590744?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Guys, came back here becoz my replacement battery is not charging again. The intense summer heat in Singapore isn't helping much. Changing the battery may lend me to same result. Now I am looking at sism3477's capacitor solution.
Mine started working weird too. The cam died immediately after I switch off the car. It started again with a Red X on the battery and died.
I have also ordered a new battery, hope to re-wire and get it working properly again.