You made a very important device used in pharmaceutical labs which stores important data, but for some fucking reason you decided to write the communication protocol so poorly that I want to cry.

You can't fucking have unique IDs for important records, but still asks me for the "INDEX" (not unique ID, fucking INDEX) to delete a particular one. YOU HAVE IT IN THE MEMORY, WHY DON'T USE IT?!
How the fuck you have made such a stupid decision… it's a device that communicates using USB so theoretically I could unplug it for a moment, remove records, add them and plug it in again and then delete a wrong one.
I can't fucking check if it's still the correct one and the user isn't an asshole every 2 seconds because this dumb device takes about 3 for each request made.

WHY?
Why I, developing a third party system, have to be responsible for these dumb vulnerabilities you've created?