Haha, it's normal. I've been using BlackBerry for two years, so I'd better not send these documents. You can experience the fun by yourself and solve the problem better in the future. Check the ROM version of the mobile phone and the options of the mobile phone-how many platforms are there, such as V4.5. 1. 188. Download this ROM online, just look at the number of platforms, no matter what is behind. 144, 188, etc., then install it, and then go to c: \ program files \ common files \ research in motion \ shared \ loader files \ 8700-v4.2.6544. Copy it, download this program WinLoader online, and use it to install the file you just copied, too. The use method is simple. Give it to me, or PM me if you don't understand.