Hi @inoue welcome to join our Flash family.
Q1. i use Antutu, but normally I dont care that much but for testing at times, do u think if the device with details info would be better?
Q2. u refered to the info from aida64 or? 6735/53 shared the same platform design internally by MTK I think that might be an issue for this case.
Q3. normally I don't use the virus sw as it's useless & it may harm the battery usage via they run background on you phone.
Q4. it's the general file format for AF2, if you need to change the file type, you can download the application accordingly or edit in PC.
Well, hope it help & enjoy your FLASH period.