Difference among Carprog V9.31 V8.21 V7.28, which is the best?

Carprog V9.31 is hot selling recently, and you would find another two versions of Carprog V8.21 and V7.28. What’s the difference among these 3 versions? Is the newest V9.31 the best one?

3 questions to help users distinguish the difference among v9.31 v8.21 v7.28

Are there more functions for firmware V8.21 than that of Carprog V4.74 (software V7.28)?
(In fact, now the newest firmware for Carprog is V8.21, which means, the newest hardware is V8.21, there is no hardware V9.31 at all.)

Newest Firmware V8.21 CARPROG, with All 21 Adapters, contain much more authorization than V4.74 or other low version CARPROG.

Packed with both software V8.21 and V9.31, software V8.21 needs activation but you will automatically get token renew after it used up. Software V9.31 can be used without activation.

Why choose Carprog V8.21 and V9.31?
CarProg FULL V9.31 is a universal diagnostic, tuning and adjustment tool for:

*Car radios


*Immobilizer repair

*EEPROM and microcontroller programmer

*Transponder key programmer

*Airbag reset

*Dashboards, New Audi dash support, support newer airbags

*Including much more authorization

*It works by plugging Carprog into your car, other end into your computer, loading up the software — and you can begin making instant changes in a few mouse clicks — that dealers would charge up to $500-$2000 for the exact same job, this will save you a ton of money.