Answer to "canon 750d error 30"I had the constant error code. I tried everything. I decided to order a replacement shutter on eBay. Didnt need it after I opened the back case of the camera, I spotted a small ion battery attached to the main board...took it out. Put the main battery back in, cycled through the on and off switch, put the small battery back in place and BAM straight to the setup screen. I wouldn't recommend this if you don't have technical skills, cam is still under warranty. You will need a tiny screw driver to get those pita screws out. Cheers!