How to beat nano virus on brutal on plague inc?

I've been playing Plague inc for awhile. It's a lot of fun and I've beat all of the levels on every difficulty except for the last two on brutal. I've tried to beat nano virus tons of time but I just can't get it. They always finish the cure before I can even infect everyone. I've looked up other strategies online but there aren't that many for this level and the ones that are there just don't seem to work for me. So any tips or strategies would be greatly appreciated. I'm playing on the iPhone 4s. I don't know if that makes a difference for when you can modify the genetic code with the special abilities before you start the game.

Here's how I do it (on Android):

--Start with ATP Boost, Genetic Mimic, Aquacyte, Extremophile, and Sympto-Statis.
--Before you even choose your starting country, purchase Code Fragment Interception, Coughing, Cysts, Abscesses, Insomnia, and Paranoia.
--Start in India
--Upgrade in the following order: Code Segment Interception, Nausea, Vomiting, Drug Resistance 1, Genetic Hardening 1.
--From here on in, if Ships or Airplanes become safe fro the disease, prioritize Water 1 or Air 1 over everything else.
--Upgrade Genetic Hardening 2.
--At this point, they should have somewhere between 50-70% of the cure. Upgrade Hyper-Sensitivity, Paralysis, and Coma. That should drop a good 10% off the cure.
--Now upgrade Water and Air all the way to Extreme Bioaerosol. By this point, the cure will likely be around 70-80%
--Upgrade Seizures, Insanity, and Radical Elements Stabilized to buy yourself more time.
--Improve your spread with Drug Resistance 2, Cold Resistance 1, and Cold Resistance 2 (cold over Hot because Greenland will be your main problem due to the India start).
--Next upgrades should be the rest of the level 1 and 2 Symptoms (Pneumonia, Sneezing, Rash, etc.), then Skin Lesions and Diarrhea.
--Follow that with Encryption Breached, then Drug Immunity.
--At this point you should be able to sit back and watch it spread like wildfire across the globe, gathering up to about 150+ DNA Points while still around 50-60% on cure. If your cure percentage is much higher, consider using Replication Factory Overload to boost infectivity for a while or Broadcast Interceptor Overload to become immune to the cure broadcast for a few weeks.
--Once all of the countries are most of the way infected, you simply buy all of the Symptoms and watch the world crash in about a month.

I typically have about 40-55% Cure when the game ends, primarily dependent on if/when ships become immune to the disease. To re-iterate, the big risk is Greenland shutting down its ports. If that happens before you infect it, the game is over (barring one of the spontaneous infections that can happen, but is extremely rare and even more rare to occur in the country you need it to happen in).