please help with two sentences

We would like to inform you that all the shipping mark for RTV goods is standard, please find the template as below: xxxx. Effective from August 2008, all the lot no. for RTV goods is need to add the alphabet ‘A’ for the lot number which is explained you though the phone before. i.e. A01, A02 …. etc on carton. If you have any problem, please contact us again