The number of firmware is unlimited. They do not need to be bought separately. Internet is not needed. With the purchase of a programmer. Your expenses are over.
Support for AT880204C and AT880204CA chips (for example, chips like sams 2850, Xer 3250, Xer 3428 and many others) on this chip
more than 44 models. Processed by Chipresseter. Not always reads the originals, then compatible chips. But overall it works satisfactorily.