Looks like my starting issues were bad gas or water in my gas. It has been starting better and better in the cold weather. I took it in also, and it does have the latest ECU map. It even started for the dealer at -6 F. Hopefully it is good to go.

The Canadian bulletin number is "BT16-03E", model & years affected:

TRAIL TRACKER EX 500EFI
(2011, 2012, 2013, 2014, 2015)
TRAIL TRACKER EX 500
(2011, 2012, 2013, 2014, 2015)
TRAIL TRACKER 500EFI
(2012, 2013, 2014, 2015)
CFORCE 500 EFI
(2015)
CFORCE 500 HO
(2016)
CFORCE 500 HO
(2016)
CFORCE 500 HO 1 UP
CFORCE 500 HO 2 UP

You will not find VIN's only software related flash #'s.

Thanks!! I take mine in in a couple weeks and the dealer said they would check this.

From CFMOTO Canada:
 

Problem:

On certain Trail Tracker 500 EFI, CFORCE 500 and CFORCE 500 HO models, there may be some difficulty
in cold starting the vehicle. When the start button is pressed the motor will turn over but not start. This issue is
more prevalent as the ambient temperature outside drops. Once the vehicle has started everything works
properly until the next cold start.

Correction:

To remedy the situation, CFMOTO has put in place new programming of the ECU aimed at rectifying these
cold start issues for each model listed in this bulletin that demonstrate this particular problem.

Important Note:

Prior to replacing the ECU in vehicles that have the issues described above, assure yourself that there are
no error codes showing on the diagnostic unit. You can also determine the programme version of the ECU
using the same diagnostic unit while using the function ''Read ECU ID'' and ECU software num. The new
program number for the Trail Tracker (EFI) and the CFORCE 500 is R4070123. The new program number
for the CFORCE 500 HO is 6R10A222. Also, ensure yourself that the correct grade of motor oil is used
while taking into account the outside temperature. Check that the battery is fully charged. You must also be
sure that there are no other mechanical problems that may show similar symptoms.

Dealer's procedure:

If you have a situation that requires an ECU replacement, please send us the ECU from the problematic
vehicle by Purolator ''collect''. Make sure that you are using the warranty parts return tag for proper
identification. We will then send you a reprogrammed ECU with the proper programming within one (1)
business day.

ctdls do you have the service bulletin number for what you have above?  I am taking mine in for cold start issues soon, and it would be nice to have the service bulletin number for the dealer.  Also, I would like to see if they list VIN numbers in it so i could verify if mine is part of the bulletin.