I have had my old Husqvarna flood on more times than I like to admit, and always out in the woods away from everybody. The way I am going to explain, I do not recommend anyone trying it. Just because I was young and dumb and got away with it does not mean anyone else should try this.
My saw always like to flood on me if it rolled over all the way on it's backside. (Upside down) I would pull and pull with a wide open throttle and I might get lucky. One day I just did not feel like pulling 52 times to get it running, so I employed an old Grandpa trick. I pulled the top cover off and set aside, than I pulled the spark plug out of the cylinder, took it over to my toolbox and grabbed the lighter my Grandpa always told me to have in there. I stuck the spark plug electrode into the flame to burn off any gas on there and warm it up a little bit. (Sometimes the saw would roll over on its back on the way to the job site) Stick it back in and started pulling. This alone gives you a 50/50 chance to get it up and running. The best way is as I just described but then take one of those long reach lighters, ones for lighting a BBQ grill that create a spark of their own to light the butane gas. Stick it down the open cylinder hold, move the spark plug boot, stand off to the side, and with a glove on, pull the trigger on the lighter and the spark will flash off all the gas in the cylinder. Put the spark plug back in and start your starting procedure. It worked for me but like I said, I was young and dumb and do not advise anyone else trying this method.