This video demonstrates how to flip a small quadcopter without using the flip function. This technique will allow you to do as many flips as you want forward or backwards.
Here are some of the models that I have confirmed will work with this technique;
Cheerson CX-10
Hubsan H107C
Hubsan H107
Yi Zhan X4
New Version Upgraded Hubsan X4 V2 H107L 2.4G 4CH RC Quadcopter RTF
http://www.banggood.com/New-Version-Upgraded-Hubsan-X4-V2-H107L-2_4G-4CH-RC-Quadcopter-RTF-p-71838FO3019606450201405H5.html
Hubsan X4 H107C 2.4G 4CH RC Quadcopter With Camera RTF
http://www.banggood.com/Hubsan-X4-H107C-2_4G-4CH-RC-Quadcopter-With-Camera-Mode-2-RTF-p-75824FO3019606450201405H5.html
Cheerson CX-10 CX10 Mini 2.4G 4CH 6 Axis LED RC Quadcopter RTF
http://www.banggood.com/Cheerson-CX10-CX10-Mini-24G-4CH-6-Axis-LED-RC-Quadcopter-RTF-p-926614FO3019606450201405H5.html
Cheerson CX-10 Wltoys V676 RC Quadcopter Spare Parts Protection Cover
http://www.banggood.com/Cheerson-CX-10-RC-Quadcopter-Spare-Parts-Protection-Cover-p-952439FO3019606450201405H5.html
Yi Zhan X4 6 Axis 2.4G RC Quacopter With LCD Transmitter RTF
http://www.banggood.com/Yi-Zhan-X4-6-Axis-24G-RC-Quacopter-With-LCD-Transmitter-RTF-p-927450FO3019606450201405H5.html