Can all of these dangerously high bad blood sugar readings be erased?

uh, NO! but you can make them more nearly normal in future! Follow your doctor's recommendations on medications, eat low carbohydrate food plan, and triple your exercise regime!

The highs are past! Go forward and don't look back! Work to lower glucose (blood sugar) levels! Regiment your life! eat at the same times each day about 4 to 6 small meals. Eat the same number of carb grams at each meal. Exercise an hour each and every day or more! Walking is fine! Take meds at the exact same hours each day! test test test to see that while you are awake your glucose stays within the range the doctor suggests.

Why would you want to erase them? I think you can delete records, but not replace them. Call the manufacturer. I'm guessing you don't want to go on insulin.

No.