I tried to flash the file the in 2020-02-26 folder root directory. http://112.74.112.110/download/2020-02-26/First of all, exactly which file are you trying to flash? What folder did you get it from on the web site? Even though there are seemingly-compatible U2W_Update.img files within the hicar subfolders in various date folders, those will not flash to our adapters.
So assuming you have a valid file, the next thing to check is your USB flash drive. It must be formatted FAT32 (not HFS, ExFat, APFS, NTFS, etc.). You should try reformatting it just in case, and then make sure that the U2W_Update.img file is the only thing on it, no folders or any other files.
It will not take anywhere close to 10 minutes to flash. If you haven't seen the blue+red light within 2 minutes then it didn't work.
Try another flash drive if you can't get the one you're using to work.
BTW I'm quite sure that the account and password are unique, because Carlinkit said they needed me to upload my log file in order to generate them. Both the Account# and password were long random strings, so I really doubt it's the same for everyone.
I had good luck getting responses from Carlinkit's amazon support. Their hours of operation occur during our overnight hours. So usually I would email them during the day and then wake up the next morning with a reply.
I used a fat32 flash drive, and it was the ONLY file on the drive. Will try another one.
I contacted or emailed carplay2air but no response. I will try carlinkit amazon next.